William James "Buddy" Hirsch (January 11, 1909 – October 25, 1997) was an American Hall of Fame trainer of Thoroughbred racehorses. He was born in San Francisco, California, the son of Hall of Fame trainer Max Hirsch. Hirsch graduated from Georgetown University and worked during the Great Depression era at a Wall Street brokerage owned by Thoroughbred racing fan and stable owner Bernard Baruch. During World War II, Hirsch served with the United States Army and earned a Bronze Star and a Purple Heart.