Didmarton is a village and civil parish in Gloucestershire, England. It is set in the Cotswold District of Gloucestershire, approximately 6 miles (10 km) south-west of Tetbury. The parish is on the county borders with South-Gloucestershire (to the south-west) and Wiltshire (to the south and south-east).

The parish lies within the District Ward of Grumbolds Ash with Avening, and this is within the area controlled by Cotswold District Council. Since 1883, the civil parish has included the former parish of Oldbury-on-the-Hill.

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