Thomas Day (disambiguation)
Thomas Day was a British author and abolitionist.
Thomas Day may also refer to:
- Thomas Day (Connecticut) (1777–1855), American lawyer, judge, and legal scholar
- Thomas Day (North Carolina), African-American furniture designer and cabinetmaker
- Thomas Fleming Day (1861–1927), British-born American sailboat designer/racer and magazine editor
- Tom Day (rugby player) (1907–1980), Welsh rugby player
- Tom Day (1935–2000), American football player