Paul Berlenbach (b. February 18, 1901, d. September 30, 1985 was the lightheavyweight boxing champion of the world from May 30, 1925, when he wrested the crown from Mike McTigue , until July 16, 1926, when he was defeated by his nemesis Jack Delaney.

Known as the "Astoria Assassin", Berlanbach was known for his devastating punching power. Interestingly, the New York City born Berlenbach represented the U.S. in the 1920 Olympics at Antwerp as a wrestler and won a gold medal. But he turned pro as a boxer in 1923. Eventually he scored a 10th round TKO over former champion Battling Siki to earn a title shot against champion Mike McTigue.

Described by writer Paul Gallico as "untutored, unlettered, slow-witted, slow-moving, and wholly lacking in animation or imagination", Berlanbach was, nevertheless, a formidable fighter. As Gallico noted, he possessed "a numbing, paralyzing body punch that caused his opponents suddenly to crumple up" as though shot. His weaknesses were his non-existent defense, and slow movements which enabled sharp shooting opponents, such as Jack Delaney, to hit him at will.

He retired with a record of 42 wins (35 KOs), 8 losses, and 3 draws. He was named to the Ring Magazine's list of 100 greatest punchers of all time.