'''Thomas Key''' may refer to:
* Thomas Hewitt Key (1799–1875), English classical scholar * Thomas Marshall Key (1819–1869), American politician * Thomas Key (colonel), 19th-century American colonel * Thomas Key (instrument maker), 19th-century English serpent maker * Thomas Key (planter), 17th-century American planter * Thomas Caius (died 1572), English academic and administrator
{{hndis|Key, Thomas}}