John A. "Jack" Farrell (July 5, 1857 – February 9, 1914), also known as "Moose", was an American Major League Baseball player who played mainly second base in his 11 seasons. Born in Newark, New Jersey, Farrell made his major league debut for the 1879 Syracuse Stars of the National League, where he played the majority of that season, until moving onto the Providence Grays, where he played the next six seasons. His career numbers include 877 hits in 884 games played, 23 home runs, and a .243 batting average. In 1881, he began the season as the player-manager for the Grays, compiling a 24 win, 27 loss record. On August 3, Farrell quit as "captain" of the team. He was succeeded by outfielder Tom York, and the team finished the season with 23 wins against 10 losses, good for second place.