The International Triathlon Union (ITU) is the world governing body for the sport of Triathlon and its related other Multisports. It is an association founded in April 1989 in Avignon, France and existing under art. 60 and following the Swiss Civil Code. The seat of ITU is in Switzerland and its headquarters shall be decided by the Executive Board. ITU is a non-profit-making organisation and does not pursue any objective for its own gains.

The Mission of ITU is to promote the sport of Triathlon, Paratriathlon and its related Multisports and disciplines throughout the world, and to lead the sport of Triathlon, as recognised by the International Olympic Committee and the International Paralympic Committee.

Triathlon, which integrates disciplines administered by other International Sports Federations, (IFs), is developed according to its own specific nature and under its sole authority.