John Flanagan or Jack Flanagan may refer to:
Sportspeople Jack Flanagan (footballer) (1902–1989), English footballer John Flanagan (hammer thrower) (1868–1938), Irish-American three-time Olympic champion in athletics John Flanagan (Limerick hurler) (born 1956), Irish hurler John Flanagan (Scottish footballer) (1942–2013), played for St. Johnstone, Partick Thistle and Clyde John Flanagan (swimmer) (born 1975), Hawaiian swimmer/coach John Flanagan (Tipperary hurler) (1947–1994), Irish hurler
Others John Flanagan (author) (1944–2026), Australian fantasy author John Flanagan (sculptor) (1865–1952), designed the Washington U.S. quarter dollar coin John C. Flanagan (1906–1996), pioneer of aviation psychology John J. Flanagan (born 1961), New York State Senator John Mack Flanagan (1946–2018), American radio DJ John T. Flanagan (1906–1996), professor of literature Jack Flanagan (Australian politician) (John Flanagan, 1888–1949), Australian politician Jack Flanagan (New Hampshire politician) (born 1957) John Flanagan, British actor, in Thriller John C. Flanagan, judge who lived in the John C. Flanagan House in Peoria, Illinois
See also Jon Flanagan (born 1993), English footballer John Flannagan (disambiguation)