Thomas or Tom Baker may refer to:

• Thomas Baker (dramatist) (c. 1680–1749), English dramatist and lawyer
• Thomas Baker (musician) (c. 1820–1888), English composer and producer of musical stage productions
• Tom Baker (born 1934), British actor who played The Doctor in Doctor Who from 1974 to 1981
• Tom Baker (American actor) (1940–1982), American actor

• Sir Thomas Baker (Royal Navy officer) (1771–1845), British admiral
• Sir Thomas Durand Baker (1837–1893), British general
• Thomas Baker (aviator) (1897–1918), Australian soldier and aviator of the First World War
• Thomas Baker (Medal of Honor) (1916–1944), American World War II Medal of Honor recipient
• Thomas Baker (American general) (born 1935), United States Air Force general

• Thomas Cheseman (or Thomas Baker, c. 1488–c. 1536), English Member of Parliament for Rye, 1523
• Thomas Baker (Arundel MP) (died 1625), English Member of Parliament for Arundel, 1601
• Sir Thomas Baker (mayor of Plymouth) (died 1926), mayor of Plymouth, England, 1913–1916
• Thomas Guillaume St Barbe Baker (1895–1966), British Fascist
• Tom Baker (Nebraska politician) (born 1948), member of the Nebraska Legislature
• Thomas Baker (Alaska politician) (born 1995), Alaska state representative

• Sir Thomas Baker (Unitarian) (1810–1886), English Unitarian minister and mayor of Manchester
• Thomas Baker (missionary) (1832–1867), English Christian missionary cannibalised in Fiji
• Thomas Nelson Baker Sr. (1860–1941), African-American minister, author and philosopher
• Tom Baker (priest) (1920–2000), English Anglican clergyman

• Thomas Southey Baker (1848–1902), English amateur rower and footballer
• Tom Baker (footballer, born 1905) (1905–1975), English footballer
• Tom Baker (1930s pitcher) (1913–1991), American Major League Baseball pitcher for the Brooklyn Dodgers and New York Giants
• Tom Baker (1960s pitcher) (1934–1980), American Major League Baseball pitcher for the Chicago Cubs
• George Baker (footballer) (Thomas George Baker, 1936–2024), Welsh footballer
• Tom Baker (bowler) (born 1954), American bowler
• Thomas Baker (cricketer) (born 1981), English cricketer who played for Yorkshire County Cricket Club and Northamptonshire County Cricket Club

• Thomas Baker (mathematician) (c. 1625–1689), English mathematician
• Thomas Baker (antiquarian) (1656–1740), English antiquarian
• Thomas Barwick Lloyd Baker (1807–1886), English educationalist, social reformer, and ornithologist
• Thomas Baker (college president) (1871–1939), American president of Carnegie Mellon University
• Thomas E. Baker, American constitutional lawyer
• R. Tom Baker, Canadian inorganic chemist
• Tom Baker (legal scholar) (born 1959), American law professor at the University of Pennsylvania Law School
• Thomas Baker (entomologist), American entomologist

• Thomas Baker (Peasants' Revolt leader) (died 1381), English landowner
• Thomas Baker (artist) (1809–1864), English landscape painter and watercolourist
• Thomas Baker (1810–1872), founder of Bakersfield, California
• Thomas Henry Baker, founder of T.H. Baker, a luxury jewellery retailer based in the United Kingdom

• Tom Baker (24 character), a character in the American TV series 24
• DC Tom Baker, a character in the British TV series The Bill
• Tom Baker, protagonist in the 2003 film Cheaper by the Dozen and its sequel

• Tom Baker Cancer Centre, a hospital in Canada
• "Tom Baker", a song by Human League on some versions of their album Travelogue