Sports Australian rules football •
Jack Ryan (footballer, born 1873) (1873–1931), Australian rules footballer for St Kilda •
Jack Ryan (footballer, born 1907) (1907–1959), Australian rules footballer for Hawthorn •
Jack Ryan (footballer, born 1914) (1914–1976), Australian rules footballer for Footscray and North Melbourne
Baseball •
Jack Ryan (catcher) (1868–1952), MLB catcher and University of Virginia baseball coach •
Jack Ryan (outfielder) (1905–1967), MLB outfielder •
Jack Ryan (pitcher) (1884–1949), Major League Baseball pitcher
Other sports •
Jack Ryan (English footballer) (born 1996), English footballer •
Jack Ryan (streetball player), American streetball player •
Jack Ryan (Moneygall hurler) (born 1946), Irish hurler and Gaelic footballer for Tipperary •
Jack Ryan (Roscrea hurler) (born 1927), Irish hurler for Tipperary •
Jack Ryan (runner), Australian masters long-distance runner •
Jack Ryan (rugby union), Irish international rugby union player
Government and military •
Jack Ryan (FBI agent) (born 1938), former FBI agent •
Jack Ryan (politician) (born 1959), former candidate for United States senator from Illinois and ex-husband of actress Jeri Ryan •
John M. Ryan (born 1949), American attorney • Jack Ryan (USAID),
USAID officer killed in Vietnam while working for the Department of Public Safety, alleged CIA officer
Other people •
Jack Ryan (designer) (1926–1991), designer and Zsa Zsa Gabor's sixth husband ==Arts, entertainment, and media==