Muhammad Ali vs. Joe Frazier, billed as the "Fight of the Century", was the boxing match between WBC/WBA heavyweight champion Joe Frazier (26–0, 23 KOs) and The Ring/lineal heavyweight champion Muhammad Ali (31–0, 25 KOs), held on Monday, March 8, 1971, at Madison Square Garden in New York City.

The Fight is widely regarded as the biggest boxing match in history and arguably the most anticipated and hyped sporting event ever. It was the first time that two undefeated boxers fought each other for the heavyweight title.

The bout held broad appeal for many Americans, including non-boxing and non-sport fans. Ali had become a symbol of the left-wing anti-establishment movement during his government-imposed exile from the ring, while Frazier had been adopted by the conservative, pro-war movement.