John Sumner may refer to:

• John Sumner (actor) (died 1649), English theatre actor during the Caroline era
• J. D. Sumner (1924–1998), American gospel singer and songwriter
• John Sumner (director) (1924–2013), English-born Australian artistic director and founder of Melbourne Theatre Company

• John Sumner (priest) (died 1772), Canon of Windsor and Headmaster of Eton College
• John Bird Sumner (1780–1862), bishop in the Church of England and Archbishop of Canterbury

• John Robert Sumner (1850–1933), amateur footballer and 1873 FA Cup finalist
• John Sumner (tea merchant) (1856–1934)
• John S. Sumner (1876–1971), headed the New York Society for the Suppression of Vice
• John Sumner (climber) (1936–2004), British climber

• Jack Sumner (1840–1907), American explorer