William Thomas
William, Willie, Bill, or Billy Thomas may refer to:
Academics
- William Isaac Thomas, American sociologist
- William Jenkyn Thomas, Welsh headmaster and author
- William Davies Thomas, Welsh literary scholar
- William G. Thomas III, American historian
- C. William Thomas, American accounting academic
Arts and entertainment
Literature
- William Moy Thomas, English journalist, literary editor and novelist
- William Thomas (Islwyn), Welsh poet
- William Thomas (Gwilym Marles), Welsh poet
- William Hannibal Thomas, American teacher, journalist, judge, writer and legislator
- William Beach Thomas, British author and journalist
- William F. Thomas, American newspaper editor
Performing arts
- William C. Thomas, American film producer
- Willie B. Thomas, American blues musician
- Bill Thomas (costume designer), American costume designer
- William Thomas Jr. (child actor), American actor
- Willie Thomas (trumpeter), American jazz trumpeter and educator
- William Thomas Jr., American actor
- Bill Thomas (actor), English actor
- Billy Thomas (drummer), American drummer with McBride & the Ride
- William Thomas (actor), Welsh actor
Visual arts
- William Thomas (architect), Anglo-Canadian architect
- William Tutin Thomas, Anglo-Canadian architect
- Bill Thomas (author), American photojournalist
Business and industry
- William Bevil Thomas, Newfoundland merchant and land developer
- William Kyffin Thomas, Australian newspaper proprietor
- William Luson Thomas, British wood-engraver and newspaper proprietor
- William Thomas (miller), Australian flour mill industrialist
- William Winstead Thomas, American insurance company president and architect
- Sir [William James Thomas, 1st Baronet], Welsh industrialist and philanthropist
- Bill Thomas (businessman), British business executive
Law and politics
Australia
- William Thomas (Australian settler), Australian colonist
- William Thomas (Victorian politician), Victorian politician
- William Lemen Thomas, Western Australian politician
- Bill Thomas (Australian politician), Western Australian politician
U.K.
- William Thomas (MP for Old Sarum and Downton), Welsh MP for Old Sarum and Downton
- William Thomas (MP for Caernarvonshire), English politician
- William Thomas (MP for Carnarvon), Welsh politician
- William Thomas (MP for Ludgershall), English lawyer and politician
- Sir William Thomas, 1st Baronet, English politician
- Sir William Thomas, 2nd Baronet, a Thomas baronet of Yapton
- Sir William Thomas, 4th Baronet, a Thomas baronet of Yapton
- Sir William Thomas, 5th Baronet, a Thomas baronet of Yapton
- William Stanley Russell Thomas, British politician
U.S.
- William C. E. Thomas, American civic leader
- William H. Thomas (Wisconsin politician), American politician
- William W. Thomas Jr., American diplomat and politician from Maine
- William Hannibal Thomas, American teacher, journalist, judge, writer and legislator
- William Reuben Thomas, American civic leader
- W. Aubrey Thomas, US Representative from Ohio
- William M. Thomas, African-American politician in South Carolina
- William D. Thomas, American politician
- William Kernahan Thomas, American judge
- William Henry Thomas, American politician from Maryland
- Bill Thomas (Montana politician), American politician in Montana House of Representatives
- Bill Thomas, US Representative from California
- Bill Thomas (writer), American legal and political author
- Bill Thomas (Alaska politician), American politician in Alaska House of Representatives
- William L. Thomas, American jurist
Elsewhere
- William Fitz Thomas, Irish judge
- William Thomas (Newfoundland politician), Newfoundland politician
- William Howell Arthur Thomas, Canadian MP
Military
- William ap Thomas, Welsh soldier and sheriff
- William Holland Thomas, American Confederate army officer
- William Nathaniel Thomas, US Navy Chief of Chaplains
- William Bain Thomas, British Army officer
- William Garfield Thomas Jr., American naval officer
- William Waffle Thomas, American air force officer, former Air Force One pilot
- William H. Thomas (Medal of Honor), American soldier
Religion
- William Thomas (bishop of Worcester), Welsh Anglican bishop of Worcester
- William Thomas (antiquary), English Anglican priest and antiquary
- William Thomas (chancellor of Llandaff Cathedral), Welsh Anglican priest and scholar
- William Griffith Thomas, English Anglican priest and theologian
- William M. M. Thomas, American Episcopal bishop of the Missionary District of Brazil
- William Nathaniel Thomas, American Methodist minister and US Navy Chief of Chaplains
- William S. Thomas, American Episcopal suffragan bishop of the Diocese of Pittsburgh
- William Thomas (archdeacon of Northumberland), English Anglican priest
- Bill Thomas (priest), British Anglican archdeacon of Llandaff
Sports
American football
- William A. Thomas, American football coach
- Bill Thomas (American football), American football player
- Willie Thomas (Canadian football), Canadian football player
- William Thomas (linebacker), American football player
- William Thomas (offensive tackle), American football player
Association football (soccer)
- William Thomas (footballer, born 1885), English soccer player
- Billy Thomas (footballer, born 1903), Welsh footballer
- Bill Thomas (New Zealand footballer), New Zealand footballer
Australian rules football
- Bill Thomas (Australian footballer), Australian rules footballer
- William "Digger" Thomas, Australian rules footballer
- Billy Thomas (Australian footballer), Australian rules footballer
- Bill Thomas (footballer, born 1930), Australian rules footballer
Rugby
- Willie Thomas (rugby union), Welsh rugby union footballer
- William Llewellyn Thomas, Welsh rugby union footballer
- Willie Thomas (rugby league), Welsh rugby league footballer
- Billy Thomas (rugby league), Welsh rugby league footballer
- William Lewis Thomas, Welsh rugby union and rugby league footballer
- Billy Thomas (rugby union), Welsh rugby union player
Other sports
- Bill Thomas (baseball), American baseball player
- Bill Thomas (sailor), Canadian sailor
- William Thomas (bowls), Welsh lawn and indoor bowler
- William Thomas (cricketer), English cricketer
- William Thomas (karateka), English karateka
- Billy Thomas (basketball), American basketball player
- Bill Thomas (ice hockey), American ice hockey player
- William Thomas (basketball), American basketball player
Others
- William Thelwall Thomas, Welsh surgeon
- Wilhelm Meyer (Adolph Beck case), gained notoriety in Adolph Beck case
- William Thomas (activist), American anti-nuclear activist
- William H. Thomas (physician), American physician
- Lia Thomas, American swimmer