Thomas or Tom Kennedy may refer to:
- Thomas Kennedy (Scottish judge) (1673–1754), joint Solicitor General for Scotland 1709–14, Lord Advocate 1714, Member of Parliament for Ayr Burghs 1720–21
- Thomas Kennedy, 9th Earl of Cassilis (bef. 1733–1775), Scottish peer, Marquess of Ailsa
- Thomas Kennedy (1776–1832), politician in Maryland, United States
- Thomas Francis Kennedy (1788–1879), Scottish Member of Parliament for Ayr Burghs 1818–1834
- Thomas Daniel Kennedy (1849?–1877), Connecticut state legislator
- Thomas Kennedy (Australian politician) (1860–1929), Australian politician
- Tom Kennedy (British politician) (1874–1954), Scottish Member of Parliament for Kirkcaldy Burghs
- Thomas Laird Kennedy (1878–1959), politician in Ontario, Canada
- Thomas Kennedy (unionist) (1887–1963), American miner, president of the UMWA 1960–1963, Lieutenant Governor of Pennsylvania 1935–1939
- Thomas Kennedy (Irish politician) (died 1947), Irish Labour Party politician and trade union official
- Thomas P. Kennedy (1951–2015), American politician, Massachusetts state senator
- Thomas Blake Kennedy (1874–1957), United States federal judge
- Thomas E. Kennedy (born 1944), American fiction writer, essayist and translator
- Tom Kennedy (actor) (1885–1965), American actor
- Tom Kennedy (television host) (1927–2020), American television game show host
- Tom Kennedy (producer) (c. 1948–2011), American film trailer producer, director and film editor
- Tom Kennedy (musician) (born 1960), jazz double-bass and electric bass player
- Tom Kennedy (Neighbours), a character on the Australian soap opera Neighbours, played by Bob Hornery
- Tommy Kennedy, a minor character introduced as a kind of host/narrator for 1988 reruns of The Transformers