John Wesley Callison was an American professional baseball player. He played in Major League Baseball (MLB) for 16 seasons and is best known for the 10 years he spent with the Philadelphia Phillies as a right fielder, from 1960 through 1969. He was an All-Star for three seasons and four All-Star games. He led the National League (NL) in triples twice and doubles once, and gained his greatest prominence in the 1964 season in which he was named the MVP of the All-Star Game and he was the runner-up for the NL Most Valuable Player Award. He also led the NL in outfield assists four consecutive times and in double plays once, and ended his career among the top five Phillies in home runs (185) and triples (84).

The Philadelphia Phillies are an American professional baseball team based in Philadelphia. The Phillies compete in Major League Baseball (MLB) as a member of the National League (NL) East Division. Since 2004, the team's home stadium has been Citizens Bank Park, located in the South Philadelphia Sports Complex.