Dorset & Wilts 1 South is an English Rugby Union league, forming part of the South West Division, for clubs primarily based in Dorset, sitting at tier 8 of the English rugby union system. Originally a single league, Dorset & Wilts 1 split into north and south regional divisions in 2004. Teams based in Berkshire participated until 2001 when they left to join the Buckinghamshire & Oxon leagues.