London Marathon London Marathon Event type: Running Date: 23rd April 2023 About the event: The London Marathon is an annual marathon held in London, United Kingdom, and is the 2nd largest annual road race in the UK. The largely flat course is set around the River Thames, starting in Blackheath and finishing at The Mall. If you would still like to run in the 2023 race, why not sign up for the virtual marathon and run for Sport in Mind! Virtual TCS London Marathon - TCS London Marathon Manage Cookie Preferences