Hirsch Jacobs (April 8, 1904 – February 23, 1970) was an American thoroughbred horse trainer and owner.
Jacobs was the leading race-winning trainer in the United States 1933-39, 1941–44, the U.S. leading money-winning trainer, 1946, 1960, 1965, and the U.S. leading money-winning breeder, 1964-67. During his career, he saddled 3,596 winners. In 1958, Hirsch Jacobs was inducted into the National Museum of Racing and Hall of Fame.
Hirsch Jacobs and his wife Ethel owned a number of horses which were raced under her name. In 1970, the Jacobs family won two of the U.S. Triple Crown races, capturing the Preakness and Belmont Stakes. They won the Preakness with Personality, who earned American Horse of the Year honors, and the Belmont with High Echelon. Both horses were owned by Ethel Jacobs and trained by their son, John. Their daughter, Patrice, became involved in the sport. She married Louis Wolfson and their Harbor View Farm owned and bred the 1978 American Triple Crown champion, Affirmed.