UK Triathlon Events Found
View all ↓Triathlons
Triathlons combine swimming, cycling and running into one of the most popular all-round physical challenges. There are a huge variety of types of triathlons to choose from in terms of distances, cycle and run terrain options, and whether the swim is in a pool, in open water (eg lake) or even the sea.
Triathlon distances:
Super Sprint Triathlons: 400m swim; 10km bike; 2.5km run.
Sprint Triathlons: 750m swim; 20km bike; 5km run.
Olympic Triathlons (aka Standard Triathlons): 1500m swim; 40km bike; 10km run.
Half Ironman Triathlons: 1.9km swim; 90km bike; 21.1km run. (This distance is also known as a “70.3” which refers to the total race distance in miles.)
Ironman™ Triathlons: 3.86km (2.4 mile) swim; 180.25km (112 mile) bike; 42.2km (26.2 mile) run. As Ironman™ is a trademark, these are also known as ‘Iron distance’ events.
Find a Race lists more than 450 triathlons every year. So whether you’re new to the sport and looking for your first Super Sprint triathlon or a hardened triathlete looking for a Double Ironman distance event, check out our comprehensive full 2025 - 2026 triathlon list below, or if you know which distance you want to search for use the links above.
Triathlons
Eirias Park Triathlon & Duathlon
Colwyn Bay, Conwy Principal AreaSlateman Triathlon & Duathlon
Caernarfon, GwyneddLondon T100 Triathlon 2025
LondonTriathlon Y Bala
Bala, GwyneddLoggerheads Trail 5k & 10k
Loggerheads Country ParkEast Leake Triathlon
Loughborough, LeicestershireTorbay Triathlon Relay
Torbay VeloparkTHE OSPREY SPRINT TRIATHLON
The Osprey Leisure Centre, Portland, DT5 1BDEirias Park Triathlon & Duathlon
Colwyn Bay, Conwy Principal AreaTorbay Triathlon Spring
Torbay Velopark, Torbay Leisure Centre Penwill Way, Paignton TQ4 5JRStratford Triathlon 2025
Stratford-upon-Avon, WarwickshireAdventure Triple Challenge
Penrith, CumbriaATW St Neots Triathlon - Race 1
Riverside Park, Regatta Meadow, St Neots, Cambridgeshire, PE19 7AB2025 Wilmslow Spring Triathlon
Wilmslow, Cheshire East2025 Tonbridge Triathlon
Tonbridge, KentTavistock Triathlon
Mount Kelly, TavistockThe All Nations Triathlon
Windsor, BerkshireMoran’s Junior Aquathlon & Triathlon in association with Pied Piper
Cheltenham, GloucestershireCheshire Triathlon 2025
Nantwich, Cheshire EastATW Box End Mixed Team Relay (incorporating British Triathlon Mixed Team Relay Championships)
Box End Lakes,Box End Rd, Bedford MK43 8RNATW Box End Triathlon
Box End Lakes,Box End Rd, Bedford MK43 8RNATW Centurion 100KM Triathlon Box End
Box End Lakes,Box End Rd, Bedford MK43 8RNRoadford Lake Triathlon
Roadford Lake, Broadwoodwidger, Lifton, PL16 0RLDorney Lake Draft-Legal Triathlon - incorporating Sprint Triathlon 2026 World Championships Qualifier
Dorney Lake, Off Court Lane, Windsor, Berks, SL4 6QPDorney Evening Triathlon
Windsor, BuckinghamshireUppingham Pool Triathlon
Oakham, LeicestershireATW Grafman Middle Distance Triathlon
Grafham Water Visitor Centre, Marlow Park, Grafham, Huntingdon, Cambs, PE28 0BHPendle Pool Triathlon powered by Fort Vale
West Craven Sports Centre, Kelbrook Rd, Barnoldswick BB18 5TBHenley Triathlon 2025
Henley-on-Thames, OxfordshireDorney Triathlon- June 2025
Windsor, BerkshireSlateman Triathlon & Duathlon
Caernarfon, GwyneddThe WMD TRIATHLON
Weymouth College, Cranford Avenue, Weymouth, DT4 7SWDartmouth Triathlon
Blackpool Sands BeachEastbourne Triathlon
Eastbourne, East SussexAlderford Triathlon 2025
Whitchurch, ShropshirePlymouth Triathlon
Mount Edgcumbe, CremylATW Stewartby Lake Triathlon & Aquabike
Stewartby Lake, Green Ln, Bedford MK43 9LYThe One for the Planet powered by Climategames
WindsorMenai Holidays ABERSOCH Triathlon
Abersoch, GwyneddThe Cardiff Triathlon & Duathlon
CardiffDarwen Triathlon, Aquathlon & Runs
Darwen, LancashireUK Ultimate Triathlon 2025
Ellesmere, ShropshireEnglish Riviera Triathlon
The Kings Drive, Torquay, Devon, TQ2 5JEArrow Valley Sprint Triathlon
Redditch, WorcestershireOffer
Arrow Valley Sprint Triathlon - 40% off until the end of January