Jack McGowan may refer to:
Jack McGowan (playwright) (1894–1977), or John McGowan, American librettist, director and producer Jack McGowan (golfer) (1930–2001), John W. "Jack" McGowan, American golfer John Reid McGowan (1872–1912), "Gentleman Jack", Australian boxer
See also Jack MacGowran (1918–1973), Irish actor