The London Triathlon (currently known as the Mazda London Triathlon, and previously the Michelob ULTRA London Triathlon, for sponsorship reasons) is the largest Triathlon in the world.

Held annually in London, the race attracts a world class field of elite athletes and in excess of 11,000 competitors and 30,000 spectators to ExCeL, in the London Docklands.

Previous winners include Tim Don, Stuart Hayes, Andrea Whitcombe, Jodie Swallow and Emma Snowsill.