Steppenwolfer (March 16, 2003 - June 21, 2018) was an American Thoroughbred racehorse. He was sired by Aptitude, who in turn was the son of the 1992 U.S. Horse of the Year and U.S. Racing Hall of Fame inductee, A.P. Indy, out of the mare, Wolfer. He was a contender for the Triple Crown in 2006, but fell short by finishing third to Barbaro in the Kentucky Derby.