South Dorset is a constituency represented in the House of Commons of the UK Parliament since 2010 by Richard Drax, a Conservative. The constituency was created as a consequence of the Redistribution of Seats Act 1885, although the area covered has changed since then.

Dorchester is the county town of Dorset, England. It is situated between Poole and Bridport on the A35 trunk route. A historic market town, Dorchester is on the banks of the River Frome to the south of the Dorset Downs and north of the South Dorset Ridgeway that separates the area from Weymouth, 7 miles (11 km) to the south. The civil parish includes the experimental community of Poundbury and the suburb of Fordington.