Marathon Swims is London's marathon of swimming.  The event returns to the iconic London Aquatic Centre, on Queen Elizabeth Olympic Park Sunday 1 November 2026.  The pool was the home of swimming during the London 2012 Olympic and Paralympic Games.

A Marathon Swim is a 10k challenge.  The distance debuted at the Beijing Olympic Games in 2008, as an open water event.  Marathon Swims redefines the challenge with an indoor, pool-based 10k Marathon Swim, 5k Half Marathon and a 1k Challenge distance swims.  A team 10k is also available for teams of two swimmers.

Event details and schedule

The Marathon Swims London event is Sunday 1 November 2026 at London Aquatics Centre, on Queen Elizabeth Olympic Park.  Times of the sessions and individual official start times will be published closer to the event.

Please make sure you arrive at least 60 minutes before your official start time to ensure you have enough time to collect elements and prepare yourself.  Parking is limited and best to consult the London Aquatics website for more information.  Arrival by public transport is recommended.

All participants will need appropriate swimwear, goggles, swim cap, water bottles (filled) and any nutrition/energy required for the event.

Good luck on taking on the ultimate swimming challenge!