Current season or competition: 2019–20 London 3 South West | |
| Sport | Rugby union |
|---|---|
| Instituted | 2000 (as London 4 South West) |
| Number of teams | 11 |
| Country |  England |
| Holders | Reeds Weybridge (1st title) (2019–20) (promoted to London 2 South West) |
| Most titles | Farnham, Winchester (2 titles) |
| Website | englandrugby.com |
London 3 South West is an English rugby union league at the eighth level of club rugby union in England involving sides based in Hampshire, Surrey and south-west London. Promoted clubs move into London 2 South West. Relegated clubs move into either Surrey 1 or Hampshire Premier depending on their location, with sides coming up from these divisions, although only 1st XV clubs are allowed in London 3 South West. Each year all clubs in the division also take part in the RFU Senior Vase - a level 8 national competition.