American baseball player (1864-1903)
John G. Gilbert (January 8, 1864 – November 12, 1903) was a Major League Baseball shortstop. He played in two games for the Pittsburgh Alleghenys, both on June 23, 1890. He started both ends of a doubleheader against the Philadelphia Phillies, collecting eight at bats without a hit. His brother Harry H. Gilbert was his teammate on that team. The Pittsburgh Alleghenies later became the Pittsburgh Pirates.