TCS London Marathon announces Double in 2027!
Published on 19 June 2026
London Marathon Events (LME) has announced that for one year only, the world famous TCS London Marathon will expand into a two day event for its 2027 edition. We’re thrilled to be the TCS London Marathon Charity of the Year for this spectacular one-off celebration, which will take place on Saturday 24 and Sunday 25 April 2027.
The unique Double format will welcome 100,000 participants across the two days, all taking on the same iconic route, from Greenwich to Westminster, in an unprecedented weekend of sport, charity and community celebration.
By extending the event across two days, the Double creates more opportunities than ever before to be part of the TCS London Marathon. It will allow a record number of participants to take on a single marathon, helping to meet the extraordinary demand for places - 1.33 million people entered the ballot for next year’s event.
Charity of the Year
In April, we were delighted to announce that our charity is the 2027 TCS London Marathon Charity of the Year, with plans to make next year’s marathon the world’s most inclusive mass participation event.
In addition to collaborating with the TCS London Marathon on some new initiatives to make the event the most inclusive yet, we are also encouraging participants to become part of a national movement through our ‘It’s Time to Show Up’ London Marathon campaign. The campaign is designed to increase public understanding of autism by helping everyone to consider the ways they can support autistic people, such as allowing more processing time and advocating for autistic colleagues in the workplace.
The event partnership marks the beginning of a lasting legacy for autistic people, with money raised by us during the 2027 event helping to fund a new advice hub and an online community app, carefully designed for the two million people who seek out our advice and guidance each year. The app will include bespoke help from autism experts, peer-to-peer opportunities and practical tools, transforming the way that we support autistic people.
The Double TCS London Marathon
The Double will also create the largest fundraising moment in UK sport. Already the world’s largest one-day annual fundraising event, with more than £90 million raised to date for charity by 2026 participants, this two-day marathon will give more charities more opportunities to raise vital funds.
Everyone who has already applied to take part next year will be entered into a ballot for both the Saturday and Sunday. Participants will not be allowed to take part in the in-person event on both days, though they will be able to complete the TCS London Marathon one day and the virtual event, TCS London Marathon MyWay, on the other.
Ballot results will be announced in early July, with places allocated through a completely random draw.
The Double will crown a full week of TCS London Marathon celebrations, beginning with an extended TCS London Marathon Running Show and featuring TCS London Marathon & Friday Night Lights 5K. The week will also include the TCS Mini London Marathon - the world’s largest one-day timed children’s event - which in 2027 will take place on Friday 23 April and will welcome more than 20,000 young participants.
Caroline Stevens, Chief Executive at the National Autistic Society, said: “We are absolutely thrilled to be Charity of the Year for the one-off Double TCS London Marathon. This incredible opportunity will allow us to celebrate our biggest ever TCS London Marathon, with a record number of participants joining us to help support autistic people and their families.
“The Double will make a massive difference to autistic people’s lives by raising vital funds and improving understanding about autism and how to show up for autistic people day-to-day.
“We can’t wait to cheer on our Team Autism participants and celebrate the biggest and most inclusive TCS London Marathon ever.”
Hugh Brasher, CEO of London Marathon Events said: “The 2027 TCS London Marathon Double is our most ambitious evolution to date – a once-in-a-generation one-time-only reimagining of what a marathon and city-wide celebration of activity can be.
“By expanding to 100,000 runners across two days, we’re opening the door for more people, more charities and more communities to take part in the world’s greatest marathon. We believe that more than £150m can be raised for good causes and the UK economy will have a £400m social and economic benefit.
“We are grateful for the vision and support of the Mayor of London, the councils on the route, the emergency services, and all the stakeholders involved who have given their support to enable this world first event to be held for London and the UK.”
Mayor of London, Sadiq Khan, said: “London is the sporting capital of the world and I am delighted that, for one year only in 2027, the world famous TCS London Marathon will expand into a two-day event.
“This unique, one-off double will allow a record 100,000 participants to enter across the two days - creating the largest fundraising moment in UK sporting history and supporting the work of so many incredible charities.
“The London Marathon showcases the very best of our capital and we will continue working closely with London Marathon Events and our partners to ensure appropriate measures are in place for the entire weekend as we build a better, more prosperous London for everyone.”
Further information
Read more about how to get involved with our charity during the 2027 TCS London Marathon
Read our news story about the Charity of the Year announcement.