#RedefiningTriathlon

LONDON T100 TRIATHLON
9-10 August 2025
Olympic Triathlon SOLD OUT! Final entries remaining across our other distances, join thousand of athletes for an epic multi-sport weekend in the Heart of London! Olympic Triathlon SOLD OUT! Final entries remaining across our other distances, join thousand of athletes for an epic multi-sport weekend in the Heart of London!

London T100 Triathlon | Participate

London

|

9-10 Aug 2025

London

9-10 Aug 2025

RACE info

Swim

Dockland

Bike

Flat

Run

Flat

Avg. Water temperature

14°C (Wetsuit mandatory)

Air Temperature

18-21°C

Race Location

Excel London

JOIN THE RACE

Following the sell out of our 2024 event, join thousands of athletes from around the globe in one of the largest and most iconic triathlons in the world! The London T100 Triathlon offers a unique and unforgettable, closed-roads racing experience through the iconic city centre. A feeling that you won’t find anywhere else.

Exciting things to look forward to

Individual Triathlons

100km

Individual

Olympic - sold out

Join Waiting List

Sprint

Individual

Super-Sprint

Individual

Team Relay Triathlons

Olympic

Team Relay

Sprint

Team Relay

City AM Triathlon Team Challenge

Team Relay

Open Water Swimming

Swim Docklands

Coming 2026

Overview

Triathlon Redefined for Every Athlete

T100 Triathlon is redefining participation sports with dynamic multi-sport festivals set in iconic locations. Dive into the action with a global community of athletes, feel the electric buzz of the start line, soak up the roar of the crowd and embrace the triumph of crossing the finish. Together, we celebrate every victory – because every finisher is a champion.

Testimonials

What athletes say about their experience

All Races

100km Triathlon

The pinnacle of triathlon! The T100 distance features a 2km swim, 80km bike and 18km run – the same covered by the world’s best professional athletes in the T100 Triathlon World Tour.

Chosen by many first timers as a true athletic challenge with a finish-line euphoria to match, it’s also the domain of athletes seeking to qualify for the Qatar T100 World Championship Finals.

Olympic Triathlon

The same distance that saw Cassandre Beaugrand and Alex Yee win gold in Paris, the Olympic-distance triathlon features a 1.5km swim, 40km bike and 10km run.

Short enough to go hard, long enough to test physical and mental strength, this classic distance is the point where speed and endurance collide. 

Equally suited to first-time triathletes and seasoned competitors, Olympic-distance is a great athletic challenge for those seeking that finish-line feeling or ideal for high-performers crunched for training time.

Team Relay option available – make a team of 2 or 3 and take on each leg of the triathlon in our relay competition.

SOLD OUT

Sprint Triathlon

With a 750m swim, 20km bike and 5km run, Sprint Triathlon is where most athletes first dip their toes into the sport of triathlon.

The combination of the shorter distances, inclusive atmosphere and celebratory finish line makes it the perfect choice for the tri-curious – or those wanting to set a blistering new PR over this classic triathlon distance.

Team Relay option available – make a team of 2 or 3 and take on each leg of the triathlon in our relay competition.

Super-Sprint Triathlon

The same competitive spirit that fuels elite races powers the super sprint triathlon—a fast, fiery challenge featuring a 400m swim, 10km bike, and 2.5km run.

Short, sharp, and packed with intensity, this distance is where speed, strategy, and grit meet. It’s over quickly—but not before testing your heart, lungs, and focus.

Perfect for first-timers looking for an approachable start, and just as thrilling for experienced triathletes chasing a PB, the super sprint offers maximum excitement with minimal training time. Whether you’re building confidence or going all-out, crossing this finish line feels just as sweet.

Swim Docklands

Coming in 2026

Dive into the Heart of London! Join us for Swim Docklands at the iconic Royal Victoria Docks, where you’ll glide through open water with London’s stunning skyline as your backdrop. Choose between a 1-mile or 2-mile swim – perfect for both newcomers and seasoned open water swimmers.

Whether you’re taking your first plunge or you’re a regular in the open water scene, this event offers a memorable and rewarding experience right in the heart of the city.

Triathlon Team Challenge

NEW FOR 2025

CTRL-ALT-COMPETE – Take on the challenge and go head-to-head with rival companies in a battle for bragging rights. Race through a thrilling course featuring a swim in Royal Victoria Dock, a traffic-free bike ride, and a fast, crowd-lined run — all while representing your team.

Enjoy exclusive Corporate Relay SWAG item, priority race pack collection & bike check-in, exclusive VIP hospitality opportunities, and the opportunity to watch the world’s best professional triathletes race on Saturday afternoon.

Team Relay option available – Form a team of 2 or 3 and take on each leg of the triathlon in our exciting relay competition.

Register with confidence

Every T100 entry is eligible for a 50% refund 90 days ahead of race day and a 25% refund until 30 days out if things don't go to plan. Head to our refund policy page for more info!

Register now

Entries to the London T100 Triathlon 2025 are now open, this is your best chance to secure your entry in what is set to be an unforgettable weekend of racing. 2024 was a sell-out event with over 4,000 participants, so get your name on the start list!

Contact Us

Need help or have more questions? Don't hesitate to get in touch.

[email protected]

Email address

Register Interest For 2026

Join thousands of participants as they take on one of the UK’s most iconic endurance events in the heart of London. Thinking of stepping up to the 100km distance, or ready to challenge yourself over the Olympic or Sprint distance? With 2025 events selling out fast, now’s the time to get ahead of the game.

Register your interest for the 2026 event and be the first to know when entries open!

Contact Us

Need help or have more questions? Don't hesitate to get in touch.

[email protected]

Email address

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YOUR JOURNEY AWAITS

take on

The T100

Are you ready to take on the challenge? The T100 finish line is calling, with its cheers and energy of accomplishment all around each step takes you closer to that unforgettable moment.  The T100 will test your limits but here you are, ready to conquer it all and seize the moment. This is the start of your T100 journey…claim it now!

Event Location

Iconic city

London

Feel the rush as you pass by the Tower Bridge, the London Eye, and other unique landmarks, all while being cheered on by enthusiastic crowds lining the route.

British Triathlon Logo

Qualify for great britain

The London T100 Olympic distance triathlon will be a GB Age Group Team Qualifier for the 2026 European Championship Standard Distance Triathlon. Further information on how to register your intent to qualify can be found HERE.

Be part of an unforgettable weekend

You Won't Want To Miss This!

New & Unique Race Distance

Premium T100 SWAG Pack

Multi-sport & Community Festival

Iconic racing location

Get Inspired, Follow the Pros

Fuel your training inspiration by following 40 of the world’s top female and male pros as they push their limits in the Race To Qatar – a series of epic events with over $7.5m on the line culminating in the Qatar T100 Triathlon World Championship Final. Watch their grit, feel their passion, and let their journey drive yours.​

Making an Aussie Exit?

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