List of Star Trek characters
This article lists characters in the various canonical incarnations of Star Trek. This includes fictional main and major characters created for the franchise.
Key
Main and recurring characters
| Character | Actor | Appearances | Rank | Posting | Position | Species |
| Airiam | Sara Mitich | Seasons 1–2 | Lt. Commander | USS Discovery | Science officer | Human cyborg |
| Airiam | Hannah Cheesman | Seasons 1–2 | Lt. Commander | USS Discovery | Science officer | Human cyborg |
| Jonathan Archer | Scott Bakula | Seasons 1–4 | Captain | Enterprise NX-01 | Commanding officer | Human |
| Asencia | Jameela Jamil | Seasons 1-2 | Civilian Ensign | Solum USS Dauntless | Tyrant Navigator | Vau N’Akat |
| Soji Asha | Isa Briones | Seasons 1-2 | Civilian | Romulan Reclamation Site | Anthropologist | Android |
| Ayala | Tarik Ergin | Seasons 1–7 | Lieutenant, JG | USS Voyager | Helmsman Security officer Maquis | Human |
| Azan | Kurt Wetherill | Seasons 6–7 | Civilian | USS Voyager Passenger | Wysanti/xB | |
| Reginald Barclay | Dwight Schultz | Seasons 3–4,6–7 Movies Seasons 2,6–7 | Lt. Commander Lieutenant, JG | Starfleet Command USS Enterprise-E USS Enterprise-D | Pathfinder Project Engineering officer | Human |
| Bareil Antos | Philip Anglim | Seasons 1–3,6 | Vedek | Bajor resident | Bajoran religious leader | Bajoran |
| Julian Bashir | Alexander Siddig | Seasons 1–7 Season 6 | Lieutenant Lieutenant, JG | Deep Space 9 | Chief medical officer | Human |
| Marie Batel | Melanie Scrofano | Seasons 1–3 | Captain | USS Cayuga | Commanding officer | Human |
| B'Etor | Gwynyth Walsh | Seasons 4–5,7 Movies Season 1 | Commander, Klingon Empire | Bird of Prey | First officer | Klingon |
| Brad Boimler | Jack Quaid | Seasons 1-5 Season 2 | Ensign Lieutenant, JG | USS Cerritos, USS Titan | Human | |
| Cleveland "Book" Booker | David Ajala | Seasons 3-5 | Civilian | USS Discovery 1031-A | Courier, Starfleet consultant | Kwejian |
| Boothby | Ray Walston | Season 5 Season 5 | Civilian | Starfleet Academy | Groundskeeper | Human |
| Borg Queen | Alice Krige | Seasons 5–7 Movies Season 2 | - | Borg Collective | Leader of Borg Collective | Borg |
| Borg Queen | Susanna Thompson | Seasons 5–7 Movies Season 2 | - | Borg Collective | Leader of Borg Collective | Borg |
| Borg Queen | Annie Wersching | Seasons 5–7 Movies Season 2 | - | Borg Collective | Leader of Borg Collective | Borg |
| Phillip Boyce | John Hoyt | "The Cage" | Lt. Commander | USS Enterprise | Chief medical officer | Human |
| Brunt | Jeffrey Combs | Seasons 3–7 | Civilian | Ferenginar resident | Ferengi commerce liquidator | Ferengi |
| Ronald Altman Bryce | Ronnie Rowe Jr. | Seasons 1–3 | Lieutenant Commander Lieutenant, JG | USS Curie USS Discovery | Communications officer | Human |
| Gabrielle Burnham | Sonja Sohn | Seasons 2-3 | - | Section 31 | Intelligence operative Astrophysicist | Human |
| Michael Burnham | Sonequa Martin-Green | Seasons 1–5 | Captain Commander | USS Discovery USS Shenzhou | Captain First officer Science officer Science specialist First officer | Human |
| Michael Burnham | Arista Arhin | Seasons 1–5 | Captain Commander | USS Discovery USS Shenzhou | Captain First officer Science officer Science specialist First officer | Human |
| Joseph Carey | Josh Clark | Seasons 1,5–7 | Lieutenant | USS Voyager | Engineering officer | Human |
| Chakotay | Robert Beltran | Seasons 1-2 Seasons 1–7 | Captain Commander | USS Protostar USS Voyager S1-7 | Captain First officer Maquis | Human |
| Christine Chapel | Majel Barrett | Seasons 1–3 Seasons 1–2 Movies | Commander Crewman | Starfleet Command USS Enterprise | Starfleet Command officer Medical officer Nurse | Human |
| Christine Chapel | Jess Bush | Seasons 1-3 | Crewman | USS Enterprise | Nurse | Human |
| Pavel Chekov | Walter Koenig | Seasons 2–3 Movies Season 5 | Commander Lieutenant | USS Enterprise-A USS Reliant USS Enterprise | Chief security officer First officer Weapons officer Navigator | Human |
| Pavel Chekov | Anton Yelchin | ST09, STID, STB | Ensign | USS Enterprise | Navigator | Human |
| Una Chin-Riley | Majel Barrett | "The Cage" Season 2 Seasons 1-2 | Commander Lt. Commander | USS Enterprise | First officer | Illyrian |
| Una Chin-Riley | Rebecca Romijn | "The Cage" Season 2 Seasons 1-2 | Commander Lt. Commander | USS Enterprise | First officer | Illyrian |
| J. M. Colt | Laurel Goodwin | "The Cage" | Yeoman | USS Enterprise | Yeoman | Human |
| Katrina Cornwell | Jayne Brook | Seasons 1-2 | Vice Admiral | Starfleet Command | Admiral of Starfleet | Human |
| Kimara Cretak | Adrienne Barbeau | Season 7 | Senator | Deep Space 9 | Romulan representative | Romulan |
| Kimara Cretak | Megan Cole | Season 7 | Senator | Deep Space 9 | Romulan representative | Romulan |
| Beverly Crusher | Gates McFadden | Seasons 1,3–7 Movies Season 2 Season 3 | Admiral Civilian Commander | Starfleet Command SS Eleos XII USS Enterprise-E USS Enterprise-D Starfleet Command | Head of Starfleet Medical Civilian doctor associated with the humanitarian organization Mariposas Chief medical officer Head of Starfleet Medical | Human |
| Jack Crusher | Ed Speleers | Season 3 ' Season 2 | Ensign Civilian | USS Enterprise NCC-1701-G SS Eleos XII | Special counselor to the captain Civilian associated with the humanitarian organization Mariposas | Human |
| Wesley Crusher | Wil Wheaton | Seasons 1–4,5,7 Season 2 ' Season 2 ' Movies | Civilian , Lieutenant, JG Cadet Ensign Ensign Civilian | USS Titan Starfleet Academy USS Enterprise-D | Traveler , Engineering officer Starfleet cadet Helmsman | Human |
| Hugh Culber | Wilson Cruz | Season 1–5 | Commander Lt. Commander | USS Discovery | Doctor | Human |
| Jal Culluh | Anthony De Longis | Seasons 1–3 | First Maje | Kazon-Nistrim | Leader of Kazon-Nistrim | Kazon |
| Elizabeth Cutler | Kellie Waymire | Season 1 | Crewman | Enterprise NX-01 | Entomologist | Human |
| Leonardo da Vinci | John Rhys-Davies | Seasons 3–4 | - | USS Voyager Program | Holographic character | Hologram |
| Damar | Casey Biggs | Seasons 4–7 | Legate Gul Glinn | Cardassia Prime CMS Groumall | Leader of Cardassian Union Dominion leader Vigilante Cardassian officer | Cardassian |
| Daniels /Kovich | David Cronenberg | Seasons 3-5 Seasons 1–4 | Federation official Crewman | Federation Headquarters Unknown | Scientist in cognitive science, with specialties in artificial sentience and intelligence Temporal agent | Mostly Human |
| Daniels /Kovich | Matt Winston | Seasons 3-5 Seasons 1–4 | Federation official Crewman | Federation Headquarters Unknown | Scientist in cognitive science, with specialties in artificial sentience and intelligence Temporal agent | Mostly Human |
| Data | Brent Spiner | Seasons 1–7 Movies Season 1 | Lt. Commander | USS Enterprise-E USS Enterprise-D | Chief operations officer | Android |
| Ezri Dax | Nicole de Boer | Season 7 | Lieutenant, JG Ensign | Deep Space 9 | Counselor | Trill |
| Jadzia Dax | Terry Farrell | Seasons 1–6 | Lt. Commander Lieutenant | Deep Space 9 | Chief science officer | Trill |
| Degra | Randy Oglesby | Season 3 | Civilian | Xindi Council | Scientist | Xindi-Primate |
| Keyla Detmer | Emily Coutts | Seasons 1–3 | Lieutenant Lieutenant, JG | USS Discovery USS Shenzhou | Helmsman | Human |
| The Doctor | Robert Picardo | Seasons 1–7 | - | USS Voyager | Chief medical officer | Hologram |
| Dolim | Scott MacDonald | Season 3 | Commander | Xindi Council | Council member | Xindi-Reptilian |
| Dukat | Marc Alaimo | Seasons 1–7 | Gul | Cardassia Prime | Religious leader Leader of Cardassia Vigilante Freighter commander Cardassian officer | Cardassian |
| Michael Eddington | Kenneth Marshall | Seasons 3–5 | Civilian Lt. Commander | Deep Space 9 | Maquis Security officer | Human |
| Elnor | Evan Evagora | Seasons 1-2 | Cadet Qowat Milat | USS Excelsior Vashti resident | Starfleet cadet Qalankhkai to Picard | Romulan |
| Kova Rin Esmar | Jin Maley | Season 3 | Ensign | USS Enterprise NCC-1701-G USS Titan | Communications officer | Haliian |
| Evek | Richard Poe | Season 7 Season 2 Season 1 | Gul | CMS Vetar | Commanding officer | Cardassian |
| Female Changeling | Salome Jens | Seasons 3–4,6–7 | - | Cardassia Prime | Leader of Dominion | Changeling |
| Vic Fontaine | James Darren | Seasons 6–7 | - | Deep Space 9 Program | Holographic entertainer | Hologram |
| Maxwell Forrest | Vaughn Armstrong | Seasons 1–4 | Vice Admiral | Starfleet Command | NX Project | Human |
| Alonzo Freeman | Phil LaMart | Seasons 1-4 | Admiral | Starfleet Command | Flag officer | Human |
| Carol Freeman | Dawnn Lewis | Seasons 1-5 | Captain | USS Cerritos | Commanding officer | Human |
| Elim Garak | Andrew Robinson | Seasons 1–7 | Civilian | Deep Space 9 resident | Tailor | Cardassian |
| Garrison | Adam Roarke | "The Cage" | Chief petty officer | USS Enterprise | Communications officer | Human |
| Philippa Georgiou | Michelle Yeoh | Seasons 1-3 Season 1 | Captain | NCIA-93 Section 31 USS Shenzhou | Intelligence operative Emperor, Mirror Universe Commanding officer | Human |
| Sonya Gomez | Lycia Naff | Season 2 Season 2 | Ensign | USS Enterprise-D | Engineering officer | Human |
| Gowron | Robert O'Reilly | Seasons 4–6 Seasons 3–7 | Chancellor | Klingon High Council | Chancellor of Klingon Empire | Klingon |
| Amanda Grayson | Jane Wyatt | Season 2 Movies | Civilian | Vulcan resident | Teacher | Human |
| Amanda Grayson | Majel Barrett | Seasons 1 | Civilian | Vulcan resident | Teacher | Human |
| Amanda Grayson | Winona Ryder | ST09 | Civilian | Vulcan resident | Teacher | Human |
| Amanda Grayson | Mia Kirshner | Season 1 Season 2 | Civilian | Vulcan resident | Teacher | Human |
| Guinan | Whoopi Goldberg | Seasons 2–6 Movies Season 2 | Civilian | USS Enterprise-D | Bartender | El-Aurian |
| Gwyndala "Gwyn" | Ella Purnell | Seasons 1-2 | Civilian | USS Protostar NX-76884 | Captain Communications officer | Vau N'Akat |
| J. Hayes | Steven Culp | Season 3 | Major | Enterprise NX-01 | MACO officer | Human |
| Hemmer | Bruce Horak | Season 1 | Lieutenant | Enterprise NCC-1701 | Chief Engineer | Aenar |
| Erika Hernandez | Ada Maris | Season 4 | Captain | Columbia NX-02 | Commanding officer | Human |
| Hogan | Simon Billig | Seasons 2–3 | Ensign | USS Voyager | Engineering officer Maquis | Human |
| Mr. Homn | Carel Struycken | Seasons 1–5 | Civilian | Betazed resident | Servant | Unknown |
| Hugh | Jonathan Del Arco | Seasons 5–7 Season 1 | - | Romulan reclamation site | Borg drone Director of Romulan reclamation site | Borg Human/xB |
| Icheb | Manu Intiraymi | Seasons 6–7 | Civilian | USS Voyager resident | Astrometrics | Borg Brunali/xB |
| Icheb | Casey King | Season 1 | Lieutenant | USS Coleman | Command officer | Borg Brunali/xB |
| Ilthuran/The Diviner | John Noble | Seasons 1-2 | Civilian | Solum Tars Lamora | Astronomer Prison colony tyrant | Vau N’Akat |
| Ishka | Cecily Adams | Seasons 3, 5–7 | Civilian | Ferenginar resident | Philanthropist | Ferengi |
| Ishka | Andrea Martin | Seasons 3, 5–7 | Civilian | Ferenginar resident | Philanthropist | Ferengi |
| Kathryn Janeway | Kate Mulgrew | Seasons 1–7 Movies Seasons 1-2 | Vice Admiral Captain | Starfleet Command USS Dauntless USS Voyager | Starfleet Admiral Commanding officer | Human |
| Jannar | Rick Worthy | Season 3 | Civilian | Xindi Council | Scientist | Xindi-Arboreal |
| Michael Jonas | Raphael Sbarge | Season 2 | Crewman | USS Voyager | Engineering officer Maquis | Human |
| Agnes Jurati | Alison Pill | Seasons 1-2 | Civilian | Daystrom Institute | Cyberneticist | Human |
| K'Ehleyr | Suzie Plakson | Seasons 2, 4 | Ambassador | Earth resident | Federation Ambassador | Klingon/Human |
| Kes | Jennifer Lien | Seasons 1–4, 6 | Civilian | USS Voyager | Medic Aeroponics | Ocampa |
| Harry Kim | Garrett Wang | Seasons 1–7 | Ensign | USS Voyager | Chief operations officer | Human |
| Kira Nerys | Nana Visitor | Seasons 1–7 | Colonel Commander Major | Deep Space 9 | Commanding officer First officer | Bajoran |
| George Kirk | Chris Hemsworth | ST09 | Captain | USS Kelvin | Commanding officer | Human |
| George Samuel "Sam" Kirk Jr. | William Shatner | Season 1 >Seasons 1–3 | Lieutenant, JG | Deneva, USS Enterprise | Xenoanthropologist, research biologist | Human |
| George Samuel "Sam" Kirk Jr. | Dan Jeannotte | Season 1 >Seasons 1–3 | Lieutenant, JG | Deneva, USS Enterprise | Xenoanthropologist, research biologist | Human |
| James T. Kirk | William Shatner | Seasons 1–3 Seasons 1–2 Movies Season 5 Seasons 1-3 | Captain Rear Admiral Cadet Lieutenant | USS Enterprise-A USS Enterprise USS Farragut | Commanding officer First officer | Human |
| James T. Kirk | Chris Pine | Seasons 1–3 Seasons 1–2 Movies Season 5 Seasons 1-3 | Captain Rear Admiral Cadet Lieutenant | USS Enterprise-A USS Enterprise USS Farragut | Commanding officer First officer | Human |
| James T. Kirk | Paul Wesley | Seasons 1–3 Seasons 1–2 Movies Season 5 Seasons 1-3 | Captain Rear Admiral Cadet Lieutenant | USS Enterprise-A USS Enterprise USS Farragut | Commanding officer First officer | Human |
| Kol | Kenneth Mitchell | Season 1 | General, Klingon Empire | Klingon High Council | Council Member | Klingon |
| Kor | John Colicos | Season 1 Season 1 Seasons 2, 4, 7 | Dahar Master Commander, Klingon Empire | Klingon Defense Force IKS Klothos | Defence officer Commanding officer | Klingon |
| Kurn | Tony Todd | Seasons 3–5 Season 4 | Crewman, Bajoran Militia Captain, Klingon Empire | Deep Space 9 IKS Hegh'ta | Security officer Commanding officer | Klingon |
| Alandra La Forge | Mica Burton | Season 3 | Ensign | Fleet Museum | Engineer | Human |
| Geordi La Forge | LeVar Burton | Seasons 1–7 Movies Season 5 Season 3 | Commodore Lt. Commander Lieutenant Lieutenant, JG | Federation Fleet Museum USS Enterprise-E USS Enterprise-D | Curator Chief engineer Helmsman | Human |
| Sidney La Forge | Ashlei Sharpe Chestnut | Season 3 | Lieutenant, JG Ensign | Enterprise NCC-1701-G USS Titan | Helmsman | Human |
| Laris | Orla Brady | Seasons 1-2 | Civilian | Earth resident | Vineyard Manager | Romulan |
| Leeta | Chase Masterson | Seasons 3–7 | Civilian | Deep Space 9 resident | Dabo Girl | Bajoran |
| Leland | Alan van Sprang | Season 2 | Captain | NCIA-93 Section 31 | Commanding officer Intelligence Operative | Human |
| Li Nalas | Richard Beymer | Season 2 | Navarch | Deep Space 9 | Liaison officer | Bajoran |
| Linus | David Benjamin Tomlinson | Seasons 2–3 | Lieutenant, JG | USS Discovery | Science officer | Saurian |
| Gabriel Lorca | Jason Isaacs | Season 1 | Captain | USS Discovery | Commanding officer | Human |
| Lore | Brent Spiner | Season 3 Seasons 1, 4, 6–7 | Civilian | Android | ||
| L'Rell | Mary Chieffo | Seasons 1–2 | Chancellor | Klingon High Council | Chancellor of Klingon Empire | Klingon |
| Lursa | Barbara March | Seasons 4–5, 7 Movies Season 1 | Captain, Klingon Empire | Bird of Prey | Commanding officer | Klingon |
| Ma’ah | Jon Curry | Seasons 2, 4-5 | Captain Helm officer | Bloodwine delivery ship IKF Che'Ta | Captain Helm officer | Klingon |
| Maihar'du | Tiny Ron Taylor | Seasons 1–3, 5–7 | Civilian | Ferenginar resident | Attendant to Grand Nagus | Hupyrian |
| Maj'el | Michaela Dietz | Season 2 | Ensign | Command division officer, USS Prodigy Starfleet Academy fourth year cadet, USS Voyager | Vulcan | |
| Mallora | Tucker Smallwood | Season 3 | Civilian | Xindi Council | Chairman | Xindi-Primate |
| Carol Marcus | Bibi Besch | Movies | Civilian Lieutenant | Project Genesis USS Enterprise | Biologist | Human |
| Carol Marcus | Alice Eve | Movies | Civilian Lieutenant | Project Genesis USS Enterprise | Biologist | Human |
| Beckett Mariner | Tawny Newsome | Seasons 1-5 Season 2 | Ensign Lieutenant, JG | USS Cerritos | Human | |
| Martok | J. G. Hertzler | Seasons 4–7 | Chancellor General, Klingon Empire | Deep Space 9 IKS Rotarran | Chancellor of Klingon Empire Commander of Klingon Forces | Klingon |
| Travis Mayweather | Anthony Montgomery | Seasons 1–4 | Ensign | Enterprise NX-01 | Helmsman | Human |
| Joseph M'Benga | Booker Bradshaw | Seasons 2-3 Seasons 1–3 | Commander | USS Enterprise | Doctor Chief medical officer, | Human |
| Joseph M'Benga | Babs Olusanmokun | Seasons 2-3 Seasons 1–3 | Commander | USS Enterprise | Doctor Chief medical officer, | Human |
| Rukiya M'Benga | Sage Arrindell | Season 1 | Civilian | USS Enterprise | Civilian | Human |
| Rukiya M'Benga | Mukambe Simamba | Season 1 | Civilian | USS Enterprise | Civilian | Human |
| Leonard McCoy | DeForest Kelley | Seasons 1–3 Seasons 1–2 Movies Season 1 Season 5 | Admiral Commander Lt. Commander | USS Enterprise-A USS Enterprise | Chief medical officer | Human |
| Leonard McCoy | Karl Urban | Seasons 1–3 Seasons 1–2 Movies Season 1 Season 5 | Admiral Commander Lt. Commander | USS Enterprise-A USS Enterprise | Chief medical officer | Human |
| Mezoti | Marley S. McClean | Seasons 6–7 | Civilian | USS Voyager Passenger | Norcadian | |
| Migleemo | Paul F. Tompkins | Seasons 1-4 | Commander? | USS Cerritos | Ship's Counselor | Klowahkan |
| Mila | Julianna McCarthy | Seasons 3,7 | Civilian | Cardassia resident | Housekeeper | Cardassian |
| Jenna Mitchell | Rong Fu | Seasons 1-3, | Lieutenant | USS Enterprise | Operations officer | Human |
| Mora Pol | James Sloyan | Seasons 2,5 | Civilian | Bajor resident | Scientist | Bajoran |
| Morn | Mark Allen Shepherd | Seasons 1–7 Season 1 | Civilian | Deep Space 9 resident | Courier | Lurian |
| Mot | Ken Thorley | Seasons 5–6 | Civilian | USS Enterprise-D | Barber | Bolian |
| Harry Mudd | Roger C. Carmel | Seasons 1–2 Season 1 Season 1 Season 1 | Civilian | Smuggler | Human | |
| Harry Mudd | Rainn Wilson | Seasons 1–2 Season 1 Season 1 Season 1 | Civilian | Smuggler | Human | |
| Matthew Arliss Mura | Joseph Lee | Season 3 | Lieutenant | USS Enterprise NCC-1701-G USS Titan | Tactical officer | Bajoran |
| Murf | Dee Bradley Baker | Season 1 | Ensign Starfleet Academy cadet Civilian | USS Protostar NX-76884 | Civilian/Security officer | Mellanoid slime worm |
| Raffi Musiker | Michelle Hurd | Seasons 1-3 | Commander Civilian | Enterprise NCC-1701-G Starfleet Intelligence USS Excelsior | First officer Undercover intelligence agent Chief operations officer | Human |
| Narek | Harry Treadaway | Season 1 | Zhat Vash Operative | Romulan | ||
| Naya | Victoria Sawal | Season 5 | Lieutenant | USS Discovery NCC 1031-A | Operations officer | Human |
| Alynna Nechayev | Natalia Nogulich | Seasons 6–7 Seasons 2–3 | Fleet Admiral | Starfleet Command | Admiral of Starfleet | Human |
| Neelix | Ethan Phillips | Seasons 1–7 | Ambassador Civilian | Talaxian Asteroid Colony USS Voyager | Federation Ambassador Chef | Talaxian |
| Nhan | Rachael Ancheril | Seasons 2-3 | Commander | USS Discovery USS Enterprise | Chief security officer | Barzan |
| Susan Nicoletti | Christine Delgado | Seasons 1–4,7 | Lieutenant, JG | USS Voyager | Engineering officer | Human |
| Eva Nilsson | Sara Mitich | Seasons 2-4 | Lieutenant | USS Voyager NCC 74656 USS Discovery | Operations officer | Human |
| Nog | Aron Eisenberg | Seasons 1–7 | Lieutenant, JG Ensign Cadet Civilian | Deep Space 9 Starfleet Academy | Operations officer Starfleet cadet Bar employee Student | Ferengi |
| Khan Noonien Singh | Ricardo Montalbán | Season 1 Movies ) | Civilian | SS Botany Bay | Superhuman | Human Augment |
| Khan Noonien Singh | Benedict Cumberbatch | Season 1 Movies ) | Civilian | SS Botany Bay | Superhuman | Human Augment |
| Khan Noonien Singh | Desmond Sivan | Season 1 Movies ) | Civilian | SS Botany Bay | Superhuman | Human Augment |
| La'an Noonien-Singh | Christina Chong Ava Cheung | Seasons 1-3 | Lieutenant | USS Enterprise | Chief security officer | Human |
| Noum | Jason Alexander | Seasons 1-2 | Lietenant | USS Voyager-A USS Dauntless | Ship’s counselor Chief medical officer | Tellarite |
| Kashimuro Nozawa | John Tampoya | Seasons 1–4,7 | Ensign | USS Voyager | Operations officer | Human |
| Keiko O'Brien | Rosalind Chao | Seasons 4–6 Seasons 1–7 | Civilian | Deep Space 9 USS Enterprise-D | Teacher/Botanist Botanist | Human |
| Miles O'Brien | Colm Meaney | Seasons 1–7 Seasons 1–7 | Chief petty officer | Starfleet Academy Deep Space 9 USS Enterprise-D | Academy professor Chief of operations Transporter chief Helmsman | Human |
| Molly O'Brien | Hana Hatae | Seasons 1–7 | Civilian | Deep Space 9 resident | Student | Human |
| Odo | René Auberjonois | Seasons 1–7 | Constable | Deep Space 9 | Chief of security | Changeling |
| Alyssa Ogawa | Patti Yasutake | Seasons 3–7 Movies | Lieutenant, JG Ensign | USS Enterprise-E USS Enterprise-D | Nurse | Human |
| Oh | Tamlyn Tomita | Season 1 | Commodore | Starfleet Command | Head of Starfleet Security | Vulcan |
| Opaka Sulan | Camille Saviola | Seasons 1–2,4 | Kai | Bajor resident | Bajoran religious leader | Bajoran |
| Erica Ortegas | Melissa Navia | Seasons 1-3 | Lieutenant | USS Enterprise | Helm officer | Human |
| Humberto “Beto” Ortegas | Mynor Pelaez Lüken | Season 3 | Civilian | Documentary filmmaker | Human | |
| Joann Owosekun | Oyin Oladejo | Seasons 1–5 | Lieutenant, JG | USS Discovery | Operations officer | Human |
| Owen Paris | Warren Munson Richard Herd | Seasons 2,5–7 | Admiral | Starfleet Command | Pathfinder Project | Human |
| Tom Paris | Robert Duncan McNeill | Seasons 1–7 Season 1 | Lieutenant Lieutenant, JG Ensign | USS Voyager | Helmsman | Human |
| Pelia | Carol Kane | Seasons 2-3 | Commander | USS Enterprise | Chief engineer | Lanthanite |
| Phlox | John Billingsley | Seasons 1–4 | Civilian | Enterprise NX-01 | Chief medical officer | Denobulan |
| Jean-Luc Picard | Patrick Stewart | Seasons 1–7 Movies Season 1 Seasons 1-3 | Admiral Captain | Earth resident USS Enterprise-E USS Enterprise-D | Commanding officer | Human |
| Renée Picard | Penelope Mitchell | Season 2 | Civilian | Europa Mission | NASA Astronaut | Human |
| Christopher Pike | Jeffrey Hunter | "The Cage" Season 1 | Admiral Captain | Starfleet Command USS Enterprise | Starfleet Admiral Commanding officer | Human |
| Christopher Pike | Bruce Greenwood | ST09, STID | Admiral Captain | Starfleet Command USS Enterprise | Starfleet Admiral Commanding officer | Human |
| Christopher Pike | Anson Mount | Seasons 1-3 Season 2 | Admiral Captain | Starfleet Command USS Enterprise | Starfleet Admiral Commanding officer | Human |
| Jankom Pog | Jason Mantzoukas | Seasons 1-2 | Ensign Starfleet Academy cadet Civilian | USS Protostar NX-76884 | Engineer | Tellarite |
| Tracy Pollard | Raven Dauda | Seasons 1–5 | Lieutenant, JG | USS Discovery | Medical officer | Human |
| Katherine Pulaski | Diana Muldaur | Season 2 | Commander | USS Enterprise-D | Chief medical officer | Human |
| Q | John de Lancie | Seasons 1–4, 6–7 Season 1 Seasons 2–3, 7 Season 1 Season 2 | - | Q Continuum resident | Q Continuum | Q |
| Quark | Armin Shimerman | Season 7 Seasons 1–7 Season 1 | Civilian | Deep Space 9 resident | Bar Owner | Ferengi |
| Teresa Ramirez | Sol Rodriguez | Civilian | Earth resident | Medical doctor associated with the humanitarian organization Mariposas | Human | |
| Ricardo Ramirez | Steve Gutierrez | Civilian | Earth resident | Student | Human | |
| Janice Rand | Grace Lee Whitney | Season 1 Movies Season 3 | Commander Chief petty officer Crewman Yeoman | USS Excelsior Starfleet Command USS Enterprise | First officer Starfleet Command officer Transporter chief Yeoman | Human |
| Jack Ransom | Jerry O'Connell | Seasons 1-5 | Commander | USS Cerritos | First officer | Human |
| Rayner | Callum Keith Rennie | Season 5 | Commander Captain | USS Discovery NCC-1031-A USS Antares | First officer Commanding officer | Kellerun |
| Rebi | Cody Wetherill | Seasons 6–7 | Civilian | USS Voyager Passenger | Wysanti/xB | |
| Malcolm Reed | Dominic Keating | Seasons 1–4 | Lieutenant | Enterprise NX-01 | Tactical officer | Human |
| Dal R'El | Brett Gray | Seasons 1-2 | Ensign Starfleet Academy cadet Civilian | Acting first officer Captain | Augment | |
| Jet Reno | Tig Notaro | Seasons 2-5 | Lt. Commander | USS Discovery USS Hiawatha | Chief Engineer | Human |
| Gen Rhys | Patrick Kwok-Choon | Seasons 1-5 | Lieutenant | USS Discovery | Tactical officer | Human |
| William Riker | Jonathan Frakes | Seasons 1–7 Movies Season 2 Season 4 Seasons 1,3 Season 1 | Captain pro tem Captain Commander | USS Titan USS Zheng He USS Titan USS Enterprise-E USS Enterprise-D | Commanding officer First officer | Human |
| Laira Rillak | Chelah Horsdal | Seasons 4-5 | Civilian | - | President of the United Federation of Planets | Human/Bajoran/Cardassian |
| Cristóbal "Chris" Rios | Santiago Cabrera | Seasons 1-2 | Captain Civilian | USS Stargazer La Sirena | Commanding officer Civilian Starship Captain | Human |
| Narissa Rizzo | Peyton List | Season 1 | Colonel | Zhat Vash Operative | Romulan | |
| Ro Laren | Michelle Forbes | Seasons 5–7 Season 3 | Commander Lieutenant Ensign | USS Enterprise-D | Starfleet Intelligence operative Maquis Helmsman | Bajoran |
| Rok-Takh | Rylee Alazraqui | Seasons 1-2 | Ensign Starfleet Academy cadet Civilian | USS Protostar NX-76884 | Science officer | Brikar |
| Rom | Max Grodénchik | Seasons 1–7 | Grand Nagus Crewman Civilian | Deep Space 9 | Grand Nagus Maintenance Engineer Bar employee | Ferengi |
| William Ross | Barry Jenner | Seasons 6–7 | Vice Admiral | Deep Space 9 | Military commander | Human |
| Michael Rostov | Joseph Will | Seasons 1–2 | Crewman | Enterprise NX-01 | Engineering officer | Human |
| Alexander Rozhenko | Jon Paul Steuer | Seasons 4–7 Season 6 | Crewman, Klingon Empire Civilian | IKS Rotarran | Weapons officer | Klingon/Human |
| Alexander Rozhenko | Brian Bonsall | Seasons 4–7 Season 6 | Crewman, Klingon Empire Civilian | IKS Rotarran | Weapons officer | Klingon/Human |
| Alexander Rozhenko | Marc Worden | Seasons 4–7 Season 6 | Crewman, Klingon Empire Civilian | IKS Rotarran | Weapons officer | Klingon/Human |
| Samanthan "Sam" Rutherford | Eugene Cordero | Seasons 1-5 | Ensign | USS Cerritos | Science officer | Human, cybernetically enhanced |
| Saavik | Kirstie Alley | Movies | Lieutenant, JG | USS Grissom USS Enterprise | Science officer Navigator | Vulcan/Romulan |
| Saavik | Robin Curtis | Movies | Lieutenant, JG | USS Grissom USS Enterprise | Science officer Navigator | Vulcan/Romulan |
| Sarek | Mark Lenard | Season 2 Seasons 1 Movies Seasons 3, 5 Seasons 1–2 | Ambassador | Vulcan resident | Federation Ambassador | Vulcan |
| Sarek | Ben Cross | Season 2 Seasons 1 Movies Seasons 3, 5 Seasons 1–2 | Ambassador | Vulcan resident | Federation Ambassador | Vulcan |
| Sarek | James Frain | Season 2 Seasons 1 Movies Seasons 3, 5 Seasons 1–2 | Ambassador | Vulcan resident | Federation Ambassador | Vulcan |
| Saru | Doug Jones | Seasons 1–5 Season 1 | Commander Captain Federation Ambassador | Federation Headquarters USS Discovery USS Shenzhou | Federation Ambassador First officer Captain First officer Science officer | Kelpien |
| Hoshi Sato | Linda Park | Seasons 1–4 | Ensign | Enterprise NX-01 | Communications officer | Human |
| Montgomery Scott | James Doohan | Seasons 1–3 Seasons 1–2 Movies Season 6 Season 5 Seasons 2-3 | Captain Commander Lt. Commander Lieutenant, Junior Grade | USS Enterprise-A USS Enterprise USS Stardiver | Chief Engineer | Human |
| Montgomery Scott | Simon Pegg | Seasons 1–3 Seasons 1–2 Movies Season 6 Season 5 Seasons 2-3 | Captain Commander Lt. Commander Lieutenant, Junior Grade | USS Enterprise-A USS Enterprise USS Stardiver | Chief Engineer | Human |
| Montgomery Scott | Martin Quinn | Seasons 1–3 Seasons 1–2 Movies Season 6 Season 5 Seasons 2-3 | Captain Commander Lt. Commander Lieutenant, Junior Grade | USS Enterprise-A USS Enterprise USS Stardiver | Chief Engineer | Human |
| Sela | Denise Crosby | Seasons 4–5 | Commander, Romulan Empire | Unknown | Romulan officer | Romulan/Human |
| Seska | Martha Hackett | Seasons 1–3,7 | None Ensign | Kazon-Nistrim USS Voyager | Kazon Affiliate Engineering officer Science officer Maquis Infiltrator | Cardassian |
| Seven of Nine | Jeri Ryan | Seasons 1-3 Seasons 4–7 | Captain Commander Civilian | Enterprise NCC-1701-G USS Titan La Sirena USS Voyager | Human/xB | |
| Shakaar Edon | Duncan Regehr | Seasons 3–5 | First Minister | Bajor resident | First Minister of Bajor | Bajoran |
| Liam Shaw | Todd Stashwick | Season 3 | Captain | USS Titan | Commanding officer | Human |
| Shaxs | Fred Tatasciore | Seasons 1-4 | Lieutenant | USS Cerritos | Chief security officer | Bajoran |
| Thy'lek Shran | Jeffrey Combs | Seasons 1–4 | General | Kumari | Andorian Imperial Guard | Andorian |
| Jennifer Sh'reyan | Lauren Lapkus | Seasons 1-4 | Ensign | USS Cerritos | Counselor | Andorian |
| Silik | John Fleck | Seasons 1–4 | Senior official | Suliban Cabal | Terrorist | Suliban |
| Benjamin Sisko | Avery Brooks | Seasons 1–7 | Captain Commander | Deep Space 9 | Commanding officer | Human |
| Jake Sisko | Cirroc Lofton | Seasons 1–7 | Civilian | Deep Space 9 resident | Journalist Student | Human |
| Jennifer Sisko | Felecia M. Bell | Seasons 1,3–4 | Lieutenant | USS Saratoga | Starfleet officer | Human |
| Joseph Sisko | Brock Peters | Seasons 4,6–7 | Civilian | Earth resident | Restaurant Owner | Human |
| Sarah Sisko | Deborah Lacey | Season 7 | Civilian | Earth resident | Holophotographer | Human |
| Luther Sloan | William Sadler | Seasons 6–7 | - | Section 31 | Intelligence Operative | Human |
| Kore Soong | Isa Briones | Season 2 | Civilian | Resident of Earth | Traveler | Human |
| Soval | Gary Graham | Seasons 1–4 | Ambassador | Earth | Vulcan Ambassador to Earth | Vulcan |
| Spock | Leonard Nimoy | "The Cage" Seasons 1–3 Seasons 1–2 Movies Season 5 Season 5 Season 2 Season 1 | Ambassador Captain Commander | New Vulcan resident USS Enterprise-A USS Enterprise Instructor | Federation Ambassador First officer Science officer | Vulcan/Human |
| Spock | Zachary Quinto | "The Cage" Seasons 1–3 Seasons 1–2 Movies Season 5 Season 5 Season 2 Season 1 | Ambassador Captain Commander | New Vulcan resident USS Enterprise-A USS Enterprise Instructor | Federation Ambassador First officer Science officer | Vulcan/Human |
| Spock | Ethan Peck | "The Cage" Seasons 1–3 Seasons 1–2 Movies Season 5 Season 5 Season 2 Season 1 | Ambassador Captain Commander | New Vulcan resident USS Enterprise-A USS Enterprise Instructor | Federation Ambassador First officer Science officer | Vulcan/Human |
| Paul Stamets | Anthony Rapp | Season 1-5 | Commander Lt. Commander Lieutenant | USS Discovery | Science officer | Human |
| Lon Suder | Brad Dourif | Seasons 2–3 | Crewman | USS Voyager | Engineering officer Maquis | Betazoid |
| Hikaru Sulu | George Takei | Seasons 1–3 Seasons 1–2 Movies Season 3 | Captain Commander Lt. Commander Lieutenant | USS Excelsior USS Enterprise-A USS Enterprise | Commanding officer Helmsman | Human |
| Hikaru Sulu | John Cho | Seasons 1–3 Seasons 1–2 Movies Season 3 | Captain Commander Lt. Commander Lieutenant | USS Excelsior USS Enterprise-A USS Enterprise | Commanding officer Helmsman | Human |
| Enabran Tain | Paul Dooley | Seasons 2–3,5 | - | Cardassia resident | Leader of Obsidian Order | Cardassian |
| Adira Tal | Blu del Barrio | Seasons 3-5 | Ensign | USS Discovery | Science officer | Human |
| Gray Tal | Ian Alexander | Seasons 3-5 | Civilian | Trill USS Discovery | Guardian Civilian | Trill |
| T'Ana | Gillian Vigman | Seasons 1-5 | Commander | USS Cerritos | Chief medical officer | Caitian |
| D'E |