Marathon Swims 2025

Marathon Swims returns to the London Aquatics Centre in 2025 (date to be announced).​

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ENTER London's marathon of swimming in 2025. Challenges include the Marathon 10k, Half Marathon 5k, 1k Challenge and Team 10k.​​

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Ballot:

The Marathon 10k is heavily oversubscribed each year, so we operate a ballot as the fairest way of distributing the places. You can skip the ballot by claiming a charity or volunteer place.

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Entries to the ballot are free of charge. Payment details are taken at point of registration to the ballot. Only successful ballot entrants will have a payment taken. All successful entrants will be notified. All ballot entries have an equal chance. It does not matter when you enter the ballot, as long as you do so before the closing date. 

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Some successful entries on the ballot may have their payment fail. If this occurs the entrant will be given 3 days to pay the amount owed to claim their place. If the entry fee remains unpaid after 3 days, then the place will be cancelled and offered on a first come, first served basis to all unsuccessful ballot entrants.