20 - 22 March 2026
UK wide
Any
Swimathon is the world's largest annual fundraising swimming event, taking place all across the UK. With a range of distances and free entry options, this really is a swim for all! Join us and play your part in raising vital funds for Cancer Research UK and Marie Curie.
Swimathon 20-22 March: Take on a Swimathon challenge as an individual with distances from 500m to 5k. Or if you want to challenge yourself a little further, take on the Triple 5k! Alternatively, swim as part of a team of 2-5 swimmers and take on a 1.5k, 2.5k or 5k challenge. Pick your distance, pick your date, pick your venue and start raising money for life-saving research today!
MySwimathon 1 - 31 March If you're not available to take part at an official Swimathon event between 20 - 22 March, choose MySwimathon! MySwimathon gives you the flexibility to take on your challenge any time between 1 and 31 March at a location that suits you.
Decide on your event or pick MySwimathon
Sign up for your event through the Swimathon website
Get fundraising for life-saving research
Complete your challenge and smash your fundraising target!
Swimathon is held in over 450 pools across the UK. Visit the venues page to check out where these pools are and to find your closest one.
12,500 swimmers all fundraising for Cancer Research UK, Marie Curie and The Swimathon Foundation
Hitting their fundraising targets to raise an overall total of around £250,000 for Cancer Research UK
Could fund the PETReA trial for more than 1 year helping doctors decide how to treat lymphoma
We've teamed up with experts to give you the best training support and advice for your event. Whether it's your first time training or you're looking to smash a PB, we've got a training plan for you.
We're with you every step of your fundraising journey so you can smash your target. Once you've signed up, we'll send you everything you need to get going such as fundraising ideas, top tips, planners and posters.
Sunday 10 May 2026
Sunday 24 May 2026
Sunday 13 September 2026