Michael Armand Hammer (September 8, 1955 – November 20, 2022) was an American businessman. He was the son of Julian Armand Hammer and the grandson of industrialist Armand Hammer. Best known for his ties to Occidental Petroleum, the company of his late grandfather, Hammer oversaw the Hammer International Foundation, the Armand Hammer Foundation, and owned numerous businesses that included Hammer Galleries, and Hammer Productions, a television and film production company located in Los Angeles, California.