2026 Event Sold Out. Register your interest for 2027.

Whether you are a first-time open water swimmer or seasoned pro, Swim Serpentine is a great challenge to make a splash with your fundraising for Brain Tumour Research. Choose from four distances: half a mile, one mile, two miles or six miles and complete your challenge against the stunning backdrop of the Serpentine in London’s Hyde Park. Dive in to this memorable challenge, make memories to last a lifetime and know that every stroke will help fund vital research to find a cure for brain tumours.

Please note, the fundraising target is £274.