Denmark competed at the 2013 World Aquatics Championships in Barcelona, Spain between 19 July to 4 August 2013.

Jeanette Ottesen got the Danes' sole gold at the championships in the 50 m butterfly, while Rikke Møller Pedersen set a new world record in the 200 m breaststroke, the first Danish long course world record in 61 years,[1] in the semi-final with 2:19.11.

She went on to win silver in the final, her first medal at the World Aquatics Championships.

In addition, Lotte Friis set a new European record in the 1500 m freestyle.

[4] Danish swimmers earned qualifying standards in the following events (up to a maximum of 2 swimmers in each event at the A-standard entry time, and 1 at the B-standard):[6][7]