Somerford Keynes is a village and civil parish in the Cotswold district of Gloucestershire, England, close to the River Thames and about 5 miles from its source. It lies on the boundary with Wiltshire, midway between Cirencester, Swindon and Malmesbury. The parish population at the 2011 census was 479, and a 2019 estimate put it at 558. The parish includes the village of Shorncote.