The men's 50 metre butterfly event in swimming at the 2013 World Aquatics Championships took place on 28–29 July at the Palau Sant Jordi in Barcelona, Spain.

[1][2] Prior to this competition, the existing world and championship records were: The heats were held at 11:05.

[6] The semifinals were held at 18:37.

[7] The final was held at 18:47.

[8]