The Professional Triathletes Organisation (PTO) and World Triathlon have confirmed that the World Triathlon Championship Series (WTCS) will return to London, UK, in 2026 as part of the London T100 Triathlon weekend. The event will be staged on July 25–26, 2026.
The new London WTCS race has secured funding from UK Sport, via The National Lottery, in partnership with British Triathlon. It will mark the first time the WTCS has been held in the capital since 2015.
The PTO and World Triathlon, the sport’s international governing body, will switch out the professional T100 (100km) distance races for the shorter Olympic distance WTCS format for the 2026 event.
Delivered by the PTO and London Marathon Events (LME) and based at ExCeL London, the weekend aims to become the ‘London Marathon of triathlon’.
While the professional race distance is changing, the amateur part of the weekend will continue to feature PTO’s signature 100km triathlon (2km swim, 80km bike, 18km run) as well as Olympic, Sprint, and Relay options.
The 2025 London T100 Triathlon weekend saw around 3,000 amateur participants take part.
Sam Renouf, Chief Executive Officer at PTO, said “Bringing a WTCS race back to London is significant news for our sport and allows triathlon to continue to build on the British team’s fantastic Olympic performances in Paris last year.
“You only need to look at what individual men’s winner Alex Yee has done this year, following in the footsteps of his father and competing in the London Marathon, to know how important sport in the capital is to it.”
He added that the announcement is “another great demonstration of our collaboration with World Triathlon, who we have a 12–year strategic partnership with to grow the sport.”
Hugh Brasher, Chief Executive Officer of London Marathon Events, which has worked with PTO on the London T100 Triathlon weekend since 2024, said “At London Marathon Events, we are focused on inspiring more people to be active. Moments such as Alex Yee, Beth Potter, Georgia Taylor-Brown, Kate Waugh, and Sam Dickinson’s incredible performances in triathlon events at the Paris Olympic Games in 2024 help us to do that.
“So it’s great to welcome the WTCS into the London T100 Triathlon weekend alongside the thousands of everyday participants who will be taking part in what is fast becoming the ‘London Marathon of the triathlon calendar’.”
World Triathlon President Antonio Arimany noted the flexibility of the PTO partnership. Arimany said “What is interesting about this announcement is our ability to work with the PTO on different distances of professional triathlon to match different opportunities.
“WTCS races are fast and furious and take place over a much shorter distance than the T100 professional races, which works well with the length of the current road permits in London.”
Ruth Daniels, Chief Executive Officer at British Triathlon, added “We’re really excited to partner with the PTO, World Triathlon and UK Sport on bringing a major event back to London. Not only is this a new major event model for us, it provides an opportunity for our incredible British athletes to perform on home soil in front of a passionate crowd of friends, family and fans.”
She added that the event will enable the governing body “to increase visibility of our great sport to new audiences, it will provide some great opportunities for hundreds of volunteers to get involved and experience another great sporting event in our capital city.”
The PTO and World Triathlon’s long-term strategic partnership, which runs until 2036, includes a framework to explore new opportunities to grow the sport together, such as hosting shorter-distance events alongside the T100 Tour.
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