The men's 100 metre backstroke event in swimming at the 2013 World Aquatics Championships took place on 29–30 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 10:14.

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

[7] The final was held at 19:06.

[8]