John Joseph "Jocko" Fields is a former Major League Baseball player. He was born on October 20, 1864 in Cork, Ireland. Jocko made his Major League debut on May 31, 1887. He played for the Pittsburgh Pirates, Pittsburgh Burghers, Philadelphia Phillies and New York Giants. Fields played 341 games in the majors, with 358 hits in 1,319 at bats. He had a lifetime average of .271. He had 12 home runs and 176 RBI. Fields died on October 14, 1950 in Jersey City, New Jersey.