Swimming at the 2013 World Aquatics Championships – Men's 100 metre backstroke

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.

Records
Prior to this competition, the existing world and championship records were:

Heats
The heats were held at 10:14.

Semifinals
The semifinals were held at 18:18.

Final
The final was held at 19:06.