Private Michael O'Regan (July 22, 1846 – May 28, 1933) was an American soldier in the United States Army who served with the 8th U.S. Cavalry Regiment during the Apache Wars.
O'Regan was one of several soldiers who received the Medal of Honor for gallantry in fighting Apache Indians in the Arizona Territory between August and October 1868.
He later enlisted in the United States Army in Boston, Massachusetts and joined Company B in the 8th U.S. Cavalry Regiment.
A participant in the Apache Wars during the late 1860s, O'Regan was part of a small cavalry group of approximately fifty troopers tasked with protecting settlers from Apache raiding parties in the Arizona Territory between August and October 1868.
During that ninety-day period, O'Regan and his colleagues faced the Apaches in heavy fighting, especially in ambushes and sniper attacks, during their patrols.