John Coleman (October 9, 1847 – October 30, 1904) was a United States Marine who received the United States military's highest decoration for bravery—the Medal of Honor—for his actions during the Korean Expedition. He was Irish-born, and received the Medal for saving the life of Boatswain's Mate Alexander McKenzie while under enemy attack on the USS Colorado. Coleman later died in California, and was buried at Mount Hope Cemetery in San Diego. His gravestone only mentions his Civil War service.