Counties 3 Dorset & Wilts South
| Current season or competition: 2024–25 Counties 3 Dorset & Wilts South | |
| Sport | Rugby union |
|---|---|
| Instituted | 1987 (as Berks/Dorset/Wilts 2) |
| Country | England |
| Most titles | Blandford, Bournemouth III, Bournemouth University, Bridport, East Dorset, North Dorset, Oakmeadians II, Sherborne II (2 titles) |
| Website | englandrugby.com |
Counties 3 Dorset & Wilts South (formerly Dorset & Wilts 2 South) is an English Rugby Union league, forming part of the South West Division, for clubs primarily based in Dorset, sitting at tier 9 of the English rugby union system.
Promoted teams typically move up to Counties 2 Dorset & Wilts South or occasionally to Counties 2 Dorset & Wilts Central. Relegated teams used to drop to Dorset & Wilts 3 South but since that division was cancelled at the end of the 2018–19 season there has been no relegation.