The Green Belt Relay is a 22-stage running relay race around 220 miles of the Green Belt around the outside of London over a single weekend.  The course mainly follow footpaths, towpaths or minor roads.

It is organised by The Stragglers running club, has been going since 1995, and involves around 35-40 teams.  Runners form teams of 11 people, and each runner runs one stage each day.

Although the race is a relay, each stage starts at a fixed time.  This allows each stage to be a competitive race in its own right, and also allows teams of all different standards to stay roughly together as they advance along the route.