The men's 100 metre butterfly event at the 1972 Olympic Games took place between August 30 and 31. This swimming event used the butterfly stroke. Because an Olympic size swimming pool is 50 metres long, this race consisted of two lengths of the pool.
Heat 1
Key: Q = Qualified
Heat 2
Key: Q = Qualified
Heat 3
Key: Q = Qualified
Heat 4
Key: Q = Qualified
Heat 5
Key: Q = Qualified
Heat 1
Heat 2
Key: WR = World record