Francis John Fennelly (February 18, 1860 – August 4, 1920) was a 19th-century Major League Baseball shortstop. He played his entire career for American Association teams: the Washington Nationals (1884), Cincinnati Red Stockings (1884–1888), Philadelphia Athletics (1888–1889), and Brooklyn Gladiators (1890). He stood 5 ft 8 in (1.73 m) (1.73 m) and weighed 168 pounds (76.5 kg). In his rookie season of 1884 he hit .311, good for eighth in the league, and his .367 on-base percentage ranked fourth. He led the league in games played (112) and runs batted in (89) in 1885.