John J. Morrissey (December 30, 1856 – April 29, 1884) was an American Major League Baseball player from Janesville, Wisconsin, who played third base for the Buffalo Bisons. His Major League career lasted 12 games over the course of 13 days. From May 2 to May 12, he batted 47 times, collected 10 hits for a .213 batting average. In the field, he committed five errors for a .865 fielding percentage. His brother Tom Morrissey also played Major League Baseball.
Morrissey died of consumption (tuberculosis) in his hometown of Janesville, and is interred at Mount Olivet Cemetery.