Triathlons in the United Kingdom
Every upcoming triathlon event we know about in the United Kingdom, soonest first. Gathered from organisers' own sites and refreshed regularly. Open one for the date, distance and entry link — and build a free sample training plan for it in a couple of minutes.
Other formats in United Kingdom
Sportives 129Running events 100Bikepacking trips 95Mountain bike events 30Gravel events 27Hybrid fitness events 24Trail running events 21Duathlons 20Hyrox events 17Self-supported ultras 14Charity rides 7Swimming events 7
Triathlons by country
United States 90Australia 37New Zealand 33Canada 19Spain 16France 13Germany 10United Arab Emirates 9Austria 6Italy 5China 4Brazil 4
East Leake Pool Sprint Triathlon 2027
East Leake, GB, United Kingdom
Triathlon
Pool-based sprint triathlon in East Leake with a 400m swim and 22km bike leg.
Dates and entry → 18 Apr 20272027 - Ribby Hall Triathlon
Preston, Lancashire, United Kingdom
Triathlon
Triathlon event at Ribby Hall in Preston, Lancashire. Priced at £55.00.
Dates and entry → 18 Apr 2027Stratford Triathlon
Stratford Leisure Centre, Stratford-upon-Avon, United Kingdom
Triathlon
Triathlon event at Stratford Leisure Centre, Stratford-upon-Avon in April 2027.
Dates and entry → 25 Apr 2027Wilmslow Spring Triathlon
Wilmslow Leisure Centre, Wilmslow, United Kingdom
Triathlon
Spring triathlon, duathlon and aquathlon event at Wilmslow Leisure Centre.
Dates and entry → 25 Apr 2027Early Brigg Sprint Triathlon
Brigg, North Lincolnshire, United Kingdom
Triathlon
Sprint triathlon event in Brigg, North Lincolnshire.
Dates and entry → 3 May 2027Tonbridge Triathlon
Tonbridge, United Kingdom
Triathlon
Tonbridge Triathlon taking place on Bank Holiday Monday in May 2027.
Dates and entry → 8 May 2027THE ROC Wales 2027
Abersoch, GB, United Kingdom
Triathlon100 km
Triathlon event in Abersoch, Wales featuring a 1.5km swim and 100km bike leg. Rated 4.0.
Dates and entry → 9 May 2027Cheshire Triathlon
Nantwich, Cheshire, United Kingdom
Triathlon
Triathlon event in Nantwich, Cheshire in May 2027.
Dates and entry → 22 May 2027Outlaw Nottingham Triathlon
National Water Sports Centre, Nottingham, United Kingdom
Triathlon2 days
Weekend triathlon event at the National Water Sports Centre, Nottingham.
Dates and entry → 23 May 2027Swansea Triathlon
Swansea, Wales, United Kingdom
Triathlon
Sprint triathlon held in Swansea, Wales.
Dates and entry → 30 May 2027Marlow Triathlon May 2027
Marlow, United Kingdom
Triathlon
A triathlon in Marlow in May 2027. Prices range from £30 to £150.
Dates and entry → 5 Jun 2027Fishguard Aquabike
Fishguard, Wales, United Kingdom
Triathlon
Aquabike event in Fishguard offering Olympic and Sprint distances.
Dates and entry → 5 Jun 2027Wales Triathlon
Fishguard, Wales, United Kingdom
Triathlon
Multi-distance triathlon in Fishguard, Wales, offering Middle, Olympic, and Sprint distances.
Dates and entry → 5 Jun 2027Blenheim Palace Triathlon
Blenheim Palace, Woodstock, United Kingdom
Triathlon2 days
Two-day triathlon and duathlon event at Blenheim Palace, Woodstock.
Dates and entry → 5 Jun 2027Henley Kids Fun Triathlon
Henley-on-Thames, Oxfordshire, United Kingdom
Triathlon
Kids fun triathlon event in Henley-on-Thames, Oxfordshire.
Dates and entry → 6 Jun 2027Henley Triathlon
Henley-on-Thames, Oxfordshire, United Kingdom
Triathlon
Triathlon event in Henley-on-Thames, Oxfordshire in June 2027.
Dates and entry → 6 Jun 2027Weymouth Triathlon
Weymouth, Dorset, United Kingdom
Triathlon
Triathlon event in Weymouth, Dorset in June 2027.
Dates and entry → 6 Jun 2027IRONMAN 70.3 Bolton
Bolton, UK, United Kingdom
Triathlon90 km
Half-distance triathlon: 1.9 km swim, 90 km bike, 21.1 km run.
Dates and entry → 12 Jun 2027Wild Boar 70.3 & Olympic Triathlon 2027
Cinderford, GB, United Kingdom
Triathlon90 km
Combined 70.3 and Olympic triathlon event in Cinderford featuring a 1.5km swim and 90km bike leg.
Dates and entry → 13 Jun 2027Slateman Triathlon Sprint 2027
Llanberis, United Kingdom
Triathlon20 km
Sprint triathlon starting in Llanberis in the heart of Eryri (Snowdonia), with a 750m swim, 20.2km bike and 5.8km run.
Dates and entry → 13 Jun 2027Slateman Ultra (140.6) Triathlon 2027
Llanberis, United Kingdom
Triathlon180 km
Full iron distance triathlon in Llanberis, Eryri, with a 2.4 mile swim, 180km bike and up to 49.9km run.
Dates and entry → 13 Jun 2027Slateman Standard Triathlon 2027
Llanberis, United Kingdom
Triathlon
Standard triathlon in Llanberis featuring a 1500m swim, 49.9km bike, and 11.7km run. Rated among the world's best triathlons by…
Dates and entry → 13 Jun 2027Slateman Triathlon Standard 2027
Llanberis, United Kingdom
Triathlon50 km
Standard triathlon in Llanberis, Eryri (Snowdonia), featuring a 1500m swim, 49.9km bike and 11.7km run.
Dates and entry → 13 Jun 2027Royal Windsor Triathlon June 2027
Windsor, GB, United Kingdom
Triathlon40 km
Triathlon event in Windsor featuring a 750m swim and 40km bike leg.
Dates and entry → 13 Jun 2027Slateman Sprint Triathlon 2027
Llanberis, United Kingdom
Triathlon
Sprint triathlon in Llanberis, Eryri (Snowdonia), comprising a 750m swim, 20.2km bike, and 5.8km run. Part of the Adventure…
Dates and entry → 13 Jun 2027Slateman Legend (70.3) Triathlon 2027
Llanberis, United Kingdom
Triathlon93 km
70.3 half-iron distance triathlon in Llanberis, Eryri, with a 1,900m swim, 92.6km bike and 23.1km run.
Dates and entry → 27 Jun 2027Llandudno Triathlon & Duathlon 2027
Llandudno, GB, United Kingdom
Triathlon50 km
Triathlon and duathlon event in Llandudno with a 750m swim and 49.9km bike leg.
Dates and entry → 27 Jun 2027Wild Horse Brewing Co. Llandudno Triathlon & Duathlon 2027
Llandudno, United Kingdom
Triathlon
Triathlon and duathlon event in Llandudno, North Wales, organised by Always Aim High Events.
Dates and entry → 2 Jul 2027Long Course Weekend Wales
Tenby, Wales, United Kingdom
Triathlon
Long Course Weekend multi-sport event held in Tenby, Wales.
Dates and entry → 11 Jul 2027IRONMAN 70.3 Swansea
Swansea, UK, United Kingdom
Triathlon90 km
In Swansea, you get the true Coastal City as you race along sweeping waterfronts and through the heart of this proud and…
Dates and entry → 11 Jul 2027Marlow Triathlon July 2027
Marlow, United Kingdom
Triathlon
A triathlon in Marlow in July 2027. Prices range from £30 to £150.
Dates and entry → 21 Aug 2027IRONMAN Leeds
Leeds, United Kingdom
Triathlon
IRONMAN 70.3 Leeds offers a fast, scenic race through the charming city of Leeds with strong local support and a vibrant…
Dates and entry → Saturday, 25 July 2026 to Sunday, 26 July 2026Outlaw Original Triathlon
National Water Sports Centre, Nottingham, UK, United Kingdom
Triathlon2 days
Outlaw Original Triathlon weekend at the National Water Sports Centre, Nottingham.
Dates and entry → Saturday, 25 July 2026 to Sunday, 26 July 2026London T100 Triathlon
Royal Victoria Dock, London, UK, United Kingdom
Triathlon2 days
London T100 Triathlon at Royal Victoria Dock over a weekend in late July 2026.
Dates and entry → 04.07.2026Monikie Triathlon Festival (British Championships)
Monikie, United Kingdom
Triathlon
British Championships standard distance aquabike qualifier for 2027 World Championship, organised by Monifieth Triathlon Club on…
Dates and entry → 07.06.2026Chester Triathlon
Chester, United Kingdom
Triathlon
A standard distance triathlon qualifier for the 2027 World Championship, organised by Active Leisure Events with open roads…
Dates and entry → 26 July 2026Guildford Triathlon
Guildford, South East, United Kingdom
Triathlon
Sprint triathlon and children's aquathlon at Guildford on Sunday 26 July 2026.
Dates and entry → 26 July 2026Forfar Triathlon
Scotland, United Kingdom
Triathlon
Fifth edition of the Forfar Triathlon with a Novice race for beginners and a Sprint race on Sunday 26 July 2026.
Dates and entry → 25 - 26 July 2026Outlaw Original Weekend 2026
East Midlands, United Kingdom
Triathlon2 days
2026 Outlaw Original Weekend including the English and British Long Distance Triathlon Championships as part of Sunday's race.
Dates and entry → 31.05.2026Northumberland Festival of Sport
Northumberland, United Kingdom
Triathlon
A standard distance triathlon qualifier for the 2027 European Championship, open roads, non-drafting organised by VO2 Max Racing.
Dates and entry → 26 July 2026Gosfield Lake Triathlon & Multisport
Essex, East, United Kingdom
Triathlon
Open water triathlon and multisport event at Gosfield Lake Resort near Braintree and Halstead, Essex. Offers triathlon…
Dates and entry → 17.05.2026Southport Triathlon & Multisport
Southport, United Kingdom
Triathlon
A standard distance triathlon qualifier for the 2027 European Championship, with closed roads, non-drafting organised by Epic…
Dates and entry → 26 July 2026Swim Bike Run Local Cambridge
Cambridge, East, United Kingdom
Triathlon
Swim Bike Run Local event in Cambridge open to adults, children and adult-child pairs. Participants need a bike with helmet.
Dates and entry → 18.07.2026Belvoir Castle Triathlon
Belvoir Castle, United Kingdom
Triathlon
A sprint distance triathlon qualifier for the 2027 European Championship, open roads, non-drafting organised by Castle Race…
Dates and entry → Sun, 12th Jul, 2026Dorney Lake Triathlon July 2026
Dorney Lake, United Kingdom
Triathlon
A Sunday triathlon at Dorney Lake in July 2026. Prices range from £25 to £120.
Dates and entry → 26 Jul 2026Snowman Triathlon, Duathlon & Swims 2026
North Wales, United Kingdom
Triathlon
Triathlon, duathlon, and swim event in North Wales, listed as an upcoming event by Always Aim High Events.
Dates and entry → 04.07.2026Monikie Triathlon Festival
Monikie, United Kingdom
Triathlon
British Championships standard distance aquabike qualifier for the 2027 World Championship, open roads, non-drafting organised…
Dates and entry → 31.05.2026One on the River - Marlow
Marlow, United Kingdom
Triathlon
A standard distance aquabike qualifier for the 2027 World Championship, open roads, non-drafting organised by One Race Events.
Dates and entry → 01.08.2026Mallory Park Triathlon
Mallory Park, United Kingdom
Triathlon
A sprint distance triathlon qualifier for the 2027 European Championship, draft legal with closed roads organised by Active…
Dates and entry → 25-26 July 2026London T100
London, UK, United Kingdom
Triathlon2 days
T100 triathlon event in London on fully closed roads in an iconic location.
Dates and entry → 16.05.2026Outlaw Nottingham Weekend
Nottingham, United Kingdom
Triathlon
A sprint distance triathlon qualifier for the 2027 World Championship, non-drafting with closed roads.
Dates and entry → 21.06.2026The Dambuster Triathlon
United Kingdom
Triathlon
A standard distance triathlon qualifier for the 2027 World Championship, organised by Pacesetter Events with closed roads…
Dates and entry → 11.07.2026Arctic One Triathlon & Para Triathlon Festival
United Kingdom
Triathlon
British Championships sprint distance triathlon qualifier for the 2027 World Championship, draft legal with closed roads.
Dates and entry → Wed, 1st Jul, 2026Dorney Lake Evening Triathlon July 2026
Dorney Lake, United Kingdom
Triathlon
An evening triathlon at Dorney Lake in July 2026. Prices range from £25 to £78.
Dates and entry → 12.07.2026Eastbourne Triathlon and Multisport Festival
Eastbourne, United Kingdom
Triathlon
A standard distance triathlon qualifier for the 2027 World Championship, organised by TriBourne Multisport Events with closed…
Dates and entry → 12.07.2026Ripon Triathlon Festival
Ripon, United Kingdom
Triathlon
A sprint distance triathlon qualifier for the 2027 European Championship, open roads, non-drafting organised by Ripon Triathlon…
Dates and entry → Sunday, 26 July 2026Snowman Triathlon & Duathlon
Plas Y Brenin, Capel Curig, UK, United Kingdom
Triathlon
Triathlon and duathlon event at Plas Y Brenin outdoor centre, Capel Curig.
Dates and entry → 5 July - 9 August 2026Swim Bike Run Develop Sunderland
Sunderland, North East, United Kingdom
Triathlon
Free Swim Bike Run sessions for ages 6–17 in Sunderland, running from 5 July to 9 August 2026, all sessions 10am–11am.
Dates and entry → 26 July 2026Dorney Triathlon 26th July
South Central, United Kingdom
Triathlon
Sprint or Standard distance triathlon at Dorney Lake, an Olympic venue. Draft illegal event.
Dates and entry → 03 AugMallory Park - Swim, Bike, & Run Sessions
Mallory Park, United Kingdom
Triathlon
Swim, bike and run training sessions at Mallory Park, organised by ATW.
Dates and entry →Found one? Get ready for it.
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