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Triathlons in South East in May 2026

Find triathlons in South East in May 2026 - filter by date, location or category, display on a map or use the advanced search to find your perfect race.

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Take on this multi-activity event as an individual or as a relay, and enjoy the opportunity to race around the unique and inspiring Olympic venue! Great water quality and flat, scenic grounds.
  • Sat 2 May
  • £58-£120
Windsor, Buckinghamshire, UK

Dorney Triathlon | May

Take on this multi-activity event as an individual or as a relay, and enjoy the opportunity to race around the unique and inspiring Olympic venue! Great water quality and flat, scenic grounds.

  • Super sprint triathlon
  • Sprint triathlon
  • Olympic triathlon
  • Sprint aquabike
  • Standard aquabike
  • Recycling
  • Beginner-friendly
  • Event village
  • Park
  • Sustainability policy
  • Age 15 & over
Delve into an action-packed day of multisport racing, featuring an inclusive Super Sprint Triathlon, 5K, 10K and Half Marathon distances for all abilities at the stunning Olympic venue!
  • Sat 9 May
  • £25-£60
Windsor, Buckinghamshire, UK

The All Nations Triathlon, 5K, 10K and Half Marathon Run

Delve into an action-packed day of multisport racing, featuring an inclusive Super Sprint Triathlon, 5K, 10K and Half Marathon distances for all abilities at the stunning Olympic venue!

  • 5K run
  • 10K run
  • Half marathon
  • Super sprint triathlon
  • Families
  • Venue accessible
  • Beginner-friendly
  • Dogs allowed at venue
  • Event village
  • Park
  • Age 11 & over
Take on this multi-activity event and take the opportunity to race around this unique and inspiring Olympic venue! Great water quality and flat, scenic grounds.
  • Wed 27 May
  • £58-£78
Windsor, Buckinghamshire, UK

Midweek Dorney Triathlon | May

Take on this multi-activity event and take the opportunity to race around this unique and inspiring Olympic venue! Great water quality and flat, scenic grounds.

  • Super sprint triathlon
  • Sprint triathlon
  • Sprint aquabike
  • Recycling
  • Beginner-friendly
  • Event village
  • Sustainability policy
  • Public transport links
  • Age 15 & over
  • Sat 30 May
  • FREE
Henley-on-Thames, Oxfordshire, UK

Henley Kids Triathlon

  • Kids triathlon 6
  • Sat 30 May
  • FREE
Henley-on-Thames, Oxfordshire, UK

Henley Triathlon

  • Novice triathlon 3

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