Osborn Warren Deignan (February 24, 1873 – April 16, 1916) was an enlisted sailor and later a Warrant Officer in the United States Navy. He received his country's highest military decoration—the Medal of Honor—for actions in the Spanish-American War. Born in Iowa, he joined the Navy in 1894 and participated in the Battle of Santiago de Cuba, the largest naval engagement of the Spanish-American war. Deignan and seven others attempted to block the entrance to Santiago Harbor, Cuba but the Spanish destroyed their ship before they could accomplish their mission, and took them prisoner. The men were later released and Deignan received the Medal of Honor for his actions. He went on to become an officer and served in various posts and ships throughout the Navy until retiring in 1906. He died in C