Moreton-in-Marsh is a small market town in the Evenlode Valley, within the Cotswolds Area of Outstanding Natural Beauty in Gloucestershire, England.
The town stands at the crossroads of the Fosse Way Roman road and the A44. It is served by Moreton-in-Marsh railway station on the Cotswold Line. It is relatively flat and low-lying compared with the surrounding Cotswold Hills. The River Evenlode rises near Batsford, runs around the edge of Moreton and meanders towards Oxford, where it flows into the Thames just east of Eynsham.
Just over 1.5 miles east of Moreton, the Four shire stone marked the boundary of the historic counties of Gloucestershire, Warwickshire, Worcestershire and Oxfordshire, until the re-organisation of the county boundaries in 1931. Since then it marks the meeting place of Gloucestershire, Warwickshire and Oxfordshire.