Michael Strauss Jacobs (March 17, 1880 – January 1953) was a boxing promoter, arguably the most powerful in the sport from the mid-1930's until his effective retirement in 1946. He was posthumously elected to the World Boxing Hall of Fame in 1982, and the International Boxing Hall of Fame in 1990.

Born in New York City in 1880, Jacobs came from a poor family and went to work as a boy, selling newspapers and candy on Coney Island excursion boats. Noticing that ticket purchases for the boats were often confusing to prospective passengers, Jacobs began scalping boat tickets. He then bought concession rights on all the boats docked at the Battery, sold train tickets to recent immigrants, and eventually ran his own ferryboats.

Jacobs then became a ticket scalper in New York, buying and selling theater, opera, or sports events tickets. He began promoting events himself, including charity balls, bike races, and circuses.