Peter O'Brien (Medal of Honor)

Peter O'Brien (1842 – September 30, 1898) was an American soldier who fought in the American Civil War. O'Brien received his country's highest award for bravery during combat, the Medal of Honor. O'Brien's medal was won for capturing a Confederate flag, and an officer with his horse and equipment, at the Battle of Waynesboro, Virginia, on March 2, 1865. He was honored with the award on March 26, 1865.

O'Brien was born in Dublin, Ireland. He joined the US Army from New York City in August 1861, and mustered out with his regiment in June 1865. He was later buried in Rosehill Cemetery, Chicago, Illinois.