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 2026 - 2027 triathlon list below, or if you know which distance you want to search for use the links above.
Triathlons
Chester Triathlon
Chester, Cheshire West and ChesterPlymouth Triathlon
Mount Edgcumbe, CremylWimbleball Lake Triathlon
Wimbleball Lake, near Dulverton, Somerset, TA22 9NUVotwo Dorney Lake Triathlon
Windsor, BerkshireATW Big East & Maldon Triathlon
Promenade Park, Park Drive, Maldon, Essex, CM9 5JQRoadford Lake Triathlon
Roadford Lake, Broadwoodwidger, Lifton, PL16 0RLLough Cutra Castle Triathlon and Multisport
Gaillimh, County GalwayATW Box End Mixed Team Relay
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 8RNThe Dorchester Sprint Triathlon
1610 Sports Centre Coburg Rd, Dorchester DT1 2HRMarlow Triathlon
Marlow, BuckinghamshireDorney Lake Evening Triathlon - May
Windsor, BerkshireOne on the River - Marlow Triathlon
Marlow, BuckinghamshireHenley Triathlon 2026
Henley-on-Thames, OxfordshireFishguard - Multi Sport Festival
The Parrog, FishguardDorney Lake Triathlon - June
Windsor, BerkshireChâteau de Chantilly Triathlon & Duathlon
Chantilly, OiseATW 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 5TBDartmouth Triathlon
Blackpool Sands BeachChester Triathlon
Chester, Cheshire West and ChesterShropshire Triathlon 2026
Ellesmere, ShropshireThe WMD Triathlon
Weymouth College, Cranford Avenue, Weymouth, DT4 7SWPlymouth Triathlon
Mount Edgcumbe, CremylOne for the Planet - Dorney Lake Triathlon
Windsor, BerkshireUltimate Triathlon 2026
Ellesmere, ShropshireRoyal Windsor Triathlon
Windsor, BerkshireSlateman Triathlon & Duathlon
Caernarfon, GwyneddCholmondeley Castle Triathlon & Multisport
Malpas, CheshireSouthend Triathlon
Car park area of Uncle Toms Cabin, Shoebury Common Road, Southend-on-Sea, SS3 9HGATW Stewartby Lake Triathlon & Aquabike
Stewartby Lake, Green Ln, Bedford MK43 9LYBowood House Triathlon
Calne, WiltshireLong Course Weekend Wales
Tenby, DyfedATW Triathlon - Mallory Park - June
Mallory Park Circuit, Church Road, Kirkby Mallory, Leicestershire, LE9 7QEATW Children’s Triathlon Mallory Park - June
Mallory Park Circuit, Church Road, Kirkby Mallory, Leicestershire, LE9 7QERace The Sun Jurassic Coast Off-Road
Swanage, DorsetOn Sale