The 2013 ITU World Triathlon Series was a series of eight World Championship Triathlon events that led up to a Grand Final held in London in September 2013.

The World Triathlon Series (WTS) visited Auckland, San Diego, Madrid, Yokohama, Kitzbühel, Hamburg, Stockholm, and London.

The series stop in Hamburg also served as the location for the 2013 ITU Team Triathlon World Championships.

The Grand Final in London included the World Championships for Under 23, Junior and Paratriathlon division, which were decided over a single race.

Elite level competitors were crowned champions based on the final WTS point standings.