Jack Farrell (1857–1914), also known as "Moose" Farrell, was a baseball player and manager.
Jack Farrell may also refer to:
Jack Farrell (outfielder) (1856–1916), outfielder for the Hartford Dark Blues baseball team Jack Farrell (infielder) (1892–1918), infielder for the Chicago Whales baseball team Jack Farrell (footballer, born 1873) (1873–1947), English footballer Jack Farrell (Australian footballer) (1872–1953), Australian rules footballer
See also John Farrell (disambiguation)