Others
- Thomas Preston (composer) (d. c. 1563), English composer
- Thomas Preston (writer) (1537–1598), master of Trinity Hall, Cambridge and possible author of King Cambyses
- General Thomas Preston, 1st Viscount Tara (1585–1655) who fought on the side of Confederation in the Irish Confederate Wars (1642-1649)
- Captain Thomas Preston (British Army officer) involved in the Boston Massacre in 1770
- Thomas Austin Preston, Jr. (1928-2012), poker player also known as Amarillo Slim
- Thomas Preston (scientist) (1860–1900), Irish scientist
- Thomas J. Preston, Jr. (1862–1955) professor of archeology at Princeton University
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