London T100 Triathlon
Get Priority Access For 2027
21-22 August 2027
London
"*" indicates required fields
Freshwater
Bike
Flat
Run
Flat
Air Temperature
18-21°C
Avg. Water temperature
18-24°C (Wetsuit)
Rated
4.4
Join thousands of participants and race in the heart of London at one of the UK's most iconic endurance events.
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.
Sunday 22 August TBC
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.
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.
Sunday 22 August TBC
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.
Saturday 21 August TBC
Super Sprint Triathlon
-
400
m -
10
km -
2.5
km
The same multisport thrill in a shorter, sharper format – the Super Sprint Triathlon features a 400m swim, 10km bike, and 2.5km run.
Designed to be quick, exciting, and accessible, this distance is perfect for newcomers ready to take on their first triathlon or experienced athletes looking to test their speed. Short enough to go full throttle, but long enough to demand grit and determination, the Super Sprint packs all the energy of triathlon into a dynamic, fast-paced race.
Whether you’re chasing your first finish line or sharpening your competitive edge, the Super Sprint delivers maximum reward in minimal time.
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.
Saturday 21 August TBC
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!
ELEVATE YOUR EXPERIENCE
T100 have partnered with Nirvana to offer you bespoke travel services so you can focus on your event and race like a pro! Choose your options during race registration or find out more now.
London T100 2025 Recap Video
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.
Gallery
TOP MOMENTS
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 Priority Access
Sign-up to priority access and be first to hear when entries go live for this iconic, sell-out event!
Contact Us
Need help or have more questions? Don't hesitate to get in touch.
[email protected]
Email address
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.
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.
Partners
London T100 Triathlon is supported by these local partners
