Thomas, Tom, or Tommy Harrison may refer to:
Arts and entertainment T. Alexander Harrison (1853–1930), American artist Thomas Erat Harrison (1858–1917), English artist Tom Harrison (musician) (born 1985), British jazz musician
Business and industry Thomas Harrison (architect) (1744–1829), English architect and bridge engineer Thomas Elliot Harrison (1808–1888), English civil engineer Thomas Harrison (ship-owner) (1815–1888), English ship-owner Thomas Harrison (surveyor) (c. 1823–1894), surveyor in Jamaica
Law and politics Thomas W. Harrison (1856–1935), U.S. representative from Virginia (second name Walter; had a cousin Thomas Willoughby Harrison (1824–1910) West Virginia judge Tom Harrison (Australian politician) (1864–1944), Australian politician Tom Harrison (American politician) (1939–2024), American politician
Military Thomas Harrison (soldier) (1606–1660), English soldier, sided with Parliament in the English Civil War Thomas Harrison (British Army officer) (1681 – before 1755), British Army officer and politician Thomas Harrison (general) (1823–1891), Confederate States Army brigadier general, district judge Thomas Sinclair Harrison (1898–?), South African World War I flying ace
Sports Thomas Harrison (footballer) (1867–1942), English footballer for Aston Villa Tommy Harrison (1892–1931), English boxer Thomas Harrison (cyclist) (born 1942), Australian cyclist Tom Harrison (baseball) (1945–2023), American baseball pitcher Tom Harrison (cricketer) (born 1971), English cricketer Tommy Harrison (footballer) (born 1974), Scottish footballer for Heart of Midlothian
Others Thomas Harrison (translator) (1555–1631), English Puritan scholar and a translator for the King James Version of the Bible Thomas Harrison (minister) (1619–1682), English nonconformist minister, active in Virginia and Ireland
See also Thomas Harrison (ship), used to transport free settlers and convicts from Ireland and England to Australia and New Zealand from 1835 to 1842 Thomas D. Harrison, a 19th-century New York pilot boat Tom Harrisson (1911–1976), British polymath