A major focus of the Double will be inspiring and supporting the next generation. Every school in London will receive two guaranteed entries for teachers or staff, recognising that the spark to get active often begins in the classroom.   

All additional income generated by the Double will be distributed by the London Marathon Foundation to projects that inspire activity for children and young people across London and the UK.  

To ensure local communities share in the occasion, extra guaranteed entries have also been allocated to every London borough along the route, enabling grassroots groups and charities to take part and benefit from the expanded event.  

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.  

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 take part 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.”