Withy is a surname. Notable people with the surname include:
Arthur Withy (1870–1943), New Zealand journalist and political activist, son of Edward Withy Edward Withy (c. 1844–1927), English shipbuilder and New Zealand politician George Withy (1924–1998), English journalist, great nephew of Edward Withy Henry Withy (1852–1922), English shipbuilding manager, brother of Edward Withy Katherine A. Withy, New Zealand philosopher