Slack (surname)
Slack is the surname of:
Politics, law and the military
- Clayton K. Slack, United States Army private awarded the Medal of Honor
- Doug Slack, Australian former politician
- George Slack, American politician
- Granville Slack, British judge and politician
- James Slack, British political advisor and journalist, former official spokesperson and Director of Communications for former prime minister Boris Johnson
- James R. Slack, American state senator and Union Army brigadier general and brevet major general
- Jerald D. Slack, US Air National Guard major general
- John Slack (cricketer), English cricketer and judge
- John Bamford Slack, British politician and Methodist lay preacher
- John M. Slack Jr., American politician
- Leighton P. Slack, American state senator, lieutenant governor of Vermont and justice of the Vermont Supreme Court
- Lemuel Ertus Slack, American state senator and lawyer
- Thomas Kerr Slack, Canadian politician
- Timothy Slack, American politician
- William Y. Slack, American lawyer, politician and Confederate officer
Science
- Adrian Slack, British landscape gardener, plantsman, author and authority on carnivorous plants
- Francis G. Slack, American physicist
- Harry Slack, British zoologist
- Nancy Guttmann Slack, American plant ecologist, bryologist and historian of science
- Roger Slack, British plant biologist and biochemist
Sports
- Andrew Slack, Australian rugby union player
- Bill Slack, Canadian retired baseball pitcher, manager and coach, member of the Canadian Baseball Hall of Fame
- Bill Slack (footballer), English footballer
- Charlie Slack, American college basketball player
- Henry James Slack, English journalist, liberal activist and science writer
- Hiram Slack (Nottinghamshire cricketer)
- Hiram Slack (North of England cricketer), nephew of the above
- Jackie Slack, British former footballer
- John Slack (cricketer), English cricketer and judge
- Laurie Slack, Australian rules footballer
- Mel Slack, English footballer
- Pres Slack, American National Basketball Association player
- Reggie Slack, American former football quarterback
- Rodney Slack, English former football goalkeeper
- Shanon Slack, American mixed martial artist
- Stuart Slack, racing cyclist, musician and folk songwriter from the Isle of Man
- Trevor Slack, English former footballer
- Wilf Slack, English cricketer
Other
- Agnes Elizabeth Slack, English Temperance advocate
- Ben Slack, American actor, known for Bachelor Party
- Eliza Fraser, née Slack, English shipwreck victim who claimed to have been captured by Australian Aborigines
- Freddie Slack, American swing and boogie-woogie pianist and bandleader
- Paul Slack, British historian
- Samuel Slack, English bass singer
- William Slack (surgeon), dean of UCL Medical School and Serjeant Surgeon to Queen Elizabeth II