John E. "Jumbo" Dwyer was an American professional baseball player who played catcher and outfield in one game for the 1882 Cleveland Blues.

[1] Recounting the game, the Detroit Free Press levied harsh criticism of his play in the field, writing: "[Cleveland] tried an experiment behind the bat in the person of a big Chicagoan named Dwyer, whom they brought along as a catcher.

This was poor judgement, for while he did not do good work behind the bat, he was utterly useless in the field expect to throw balls back to the diamond, and the Detroit boys faced around and sent them out to him.

Dwyer told the reporter that he was no condition to play the game after not sleeping on his trip from Chicago, and alleged that Cleveland pitcher George Bradley was crossing him up intentionally.

[3] The following spring, Dwyer signed with the Trenton, New Jersey club of the Interstate Association.