Thomas Day

Thomas Day may refer to:

Sports

 * Tom Day (rugby union) (1907–1980), Welsh rugby union player
 * Tom Day (American football) (1935–2000), American football player
 * Tom Day (footballer) (born 1997), English footballer

Others

 * Thomas Day (writer) (1748–1789), British author and abolitionist
 * Thomas Day (musician), 17th-century English choirmaster
 * Thomas Day (pirate) (fl. 1697), English pirate and privateer active off New England
 * Thomas Day (Connecticut judge) (1777–1855), American lawyer, judge, and legal scholar
 * Thomas Day (cabinetmaker) (1801–1861), African-American furniture designer and cabinetmaker
 * Thomas B. Day (1932–2021), American college president and physicist
 * Thomas Fleming Day (1861–1927), British-born American sailboat designer/racer and magazine editor
 * Thomas Cuthbert Day (1852–1935), British chemist, photo-engraver and geologist