Harry Day (1898–1977) was a Royal Marine and RAF pilot during the Second World War, prisoner of war and noted escapee.

Harry Day may also refer to:

• Harry Day (politician) (1880–1939), British labour party politician, Member of Parliament 1924–1931, 1935–1939
• Harry Day (rugby union) (1863–1911), Welsh international rugby union forward
• Harry G. Day (born 1906), American chemist and professor
• Harry S. Day (1871–1956), Ohio State Treasurer

• Harold Day (disambiguation)
• Henry Day (disambiguation)
• Day (surname)

This disambiguation page lists articles about people with the same name.
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