John Leary may refer to: John Leary (politician) (1837–1905), businessman, mayor of Seattle (1884–1885) John Leary (baseball) (1891–1961), 1910s baseball player John Leary (cricketer) (1867-1940), Australian cricketer Jack Leary (1857–1905), 1880s baseball player John J. Leary Jr. (1874–1944), American journalist Scott Leary (John Scott Leary, 1881–1958), American swimmer John P. Leary (died 1993), Jesuit priest, president of Gonzaga University (1961–1969) John Leary (actor), Australian theatre and television actor (active from 1990s through present), Kangaroo Creek Gang and others John S. Leary (1845–1904), American lawyer and politician John Frederic Leary (1798–1861), British librarian and antiquarian