Royal Windsor Triathlon

The Royal Windsor Triathlon is established as one of the top events in the triathlon calendar. Few triathlons can compare with the historical backdrop of Windsor Castle, the majestic River Thames, the green vista of the Long Walk and the stunning overall surroundings of Windsor.

The day begins with an open water swim in the River Thames keep an eye out for swans! Next, take on a thrilling road cycle through the historic town of Windsor, passing Windsor Castle and heading into the scenic countryside. You’ll finish with a memorable run into Windsor Great Park, along the iconic Long Walk, with the castle framing your final strides.

Whether you’re going solo or teaming up for the relay, the Royal Windsor Triathlon is a must do event with a royal backdrop and a buzzing race village atmosphere.

As part of our team, you’ll receive:

• A Terrence Higgins Trust t-shirt to wear with pride
• Expert fundraising advice and unlimited support from our dedicated team
• Pre-event training guidance to help you prepare

Your support and fundraising help fund vital services including our one-of-a-kind sexual health helpline, HIV testing, counselling, and peer support programmes.

We are working to ensure that there will be no new HIV cases in the UK by 2030. Everyone living with HIV will be diagnosed, in treatment and care, free from stigma and able to take advantage of life’s opportunities.

Our dedicated fundraising team at Terrence Higgins Trust is here to support you every step of the way.

We ask that you consider whether you're confident in reaching the fundraising target before signing up.

Setting up a JustGiving fundraising page is quick and easy and all donations will come directly to us at Terrence Higgins Trust.

If sponsorship targets aren't reached, it can impact our ability to continue our vital work at Terrence Higgins Trust. It can even leave us out of pocket, as we pay a certain amount for each event space.

If you have any concerns about fundraising at any point, please don’t hesitate to contact us at [email protected]. We’re always happy to help!

Click the registration button and join our team today. 

Check out our 2026 events calendar or Run for Charity, where you’ll find marathons, half marathons, and 10Ks taking place across the UK.

Any questions or want to tell us you're signing up to a trek? Contact our Fundraising team.