The Marlborough Downs Challenge is an ultramarathon across the Marlborough Downs. The race is nearly all on footpaths. It starts and finishes in Marlborough and the course goes as far as Devizes. The distance is 53 km (33 miles). The race is organised by Marlborough Running Club. A 32 km (20 mile) event is organised on the same day. A number of walkers participate in the events.
The 2010 event took place on 15 May and will be the 11th running of the event.