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
18-24°C (Wetsuit mandatory)
Air Temperature
18-21°C
Race Location
Excel London
ENTRIES CLOSING 20TH JULY!
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
- Premium T100 Swag Pack
- Closed Roads Racing
- Multi-Sport Festival Atmosphere
- Iconic Racing Location
- FREE Finisher Pictures - 100km & Olympic
Individual Triathlons
100km
Individual
-
2
km -
80
km -
18
km
Olympic
Individual
-
1.5
km -
40
km -
10
km
Sprint
Individual
-
750
m -
20
km -
5
km
Super-Sprint
Individual
-
400
m -
10
km -
2.5
km
Team Relay Triathlons
Olympic
Team Relay
-
1.5
km -
40
km -
10
km
Sprint
Team Relay
-
750
m -
20
km -
5
km
City AM Triathlon Team Challenge
Team Relay
-
750
m -
20
km -
5
km
Open Water Swimming
Swim Docklands
Coming 2026
-
1
mile -
2
miles
Register To Volunteer
Be part on an epic multi sport weekend and volunteer at the London T100 Pro & Amateur Age-Group Triathlons on Saturday 9th and Sunday 10th August.
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.
All Races
100km Triathlon
-
2
km -
80
km -
18
km
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
-
1.5
km -
40
km -
10
km
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.Â
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.
Sprint Triathlon
-
750
m -
20
km -
5
km
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
-
400
m -
10
km -
2.5
km
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
-
1
mile -
2
miles
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
-
750
m -
20
km -
5
km
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
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.
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.​
