Thomas or Tom Baker may refer to:

Politicians

• Thomas Cheseman or Thomas Baker (c. 1488–1536 or later), Member of Parliament for Rye
• Thomas Baker (died 1625), Member of Parliament for Arundel
• Tom Baker (Nebraska politician) (born 1948), member of Nebraska Legislature
• Thomas Guillaume St. Barbe Baker (1895–1966), Fascist activist and former British Army and RAF officer
• Colonel Thomas Baker (1810–1872), founder of Bakersfield, California
• Thomas Baker (Alaska politician), Alaska state representative

Sports

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

Military

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

Religion

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

Actors

• Tom Baker (born 1934), played The Doctor on Doctor Who from 1974 to 1981
• Tom Baker (American actor) (1940–1982)

Education

• Tom Baker (professor) (born 1959), law professor at the University of Pennsylvania Law School
• Thomas E. Baker, professor of Constitutional law and former administrative assistant to William Rehnquist
• Thomas Baker (college president) (1871–1939), president of Carnegie Mellon University
• Thomas Baker (entomologist), American professor at Penn State University

Others

• Thomas Baker (antiquarian) (1656–1740), English antiquarian
• Thomas Baker (artist) (1809–1864), English landscape painter and watercolourist
• Thomas Baker (Peasants' Revolt leader) (died 1381), English landowner
• Thomas Baker (musician), composer and producer of musical stage productions
• Thomas Baker (mathematician) (1625?–1689), English mathematician
• Thomas Baker (dramatist) (c. 1680–1749), English dramatist and lawyer
• R. Tom Baker, inorganic chemist
• Thomas Barwick Lloyd Baker (1807–1886), English educationalist, social reformer, and ornithologist

Other uses

• Tom Baker Cancer Centre, a hospital in Canada
• Tom Baker (24 character)
• DC Tom Baker, a character on The Bill
• Tom Baker, protagonist in the 2003 film Cheaper by the Dozen and its sequel
• "Tom Baker", a song by Human League on some versions of Travelogue