One Man's Hero is a 1999 historical war drama film directed by Lance Hool and starring Tom Berenger, Joaquim de Almeida and Daniela Romo. The film has the distinction of being the last film released by Orion Pictures' arthouse division Orion Classics, as well as being the last Orion Pictures film, until 2013's Grace Unplugged, when Metro-Goldwyn-Mayer revived the Orion Pictures brand.

The film is a dramatization of the true story of John Riley and the Saint Patrick's Battalion, a group of Irish Catholic immigrants who desert the mostly Protestant U.S. Army to join the mostly Catholic Mexican side during the Mexican–American War of 1846 to 1848.