John Warren Merson (January 17, 1922 – April 28, 2000) was an American professional baseball player.

Merson was originally signed by the Washington Senators in 1940, but was released in 1941 without playing a single game for them.

In 1947, the Pirates signed Merson as a free agent, and he made his debut with Pittsburgh in 1951.

[1] Merson was the first player in Major League history to have ten RBIs in their first five games, a feat equalled only by Danny Espinosa in 2010 and Yasiel Puig in 2013.

Merson appeared in one game for Boston in 1953 before being sent to the San Diego Padres of the Pacific Coast League.