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.
The teams competing in 2021-22 achieved their places in the league based on performances in 2019-20, the 'previous season' column in the table below refers to that season not 2020-21.
On 30 October the RFU announced that a decision had been taken to cancel Adult Competitive Leagues (National League 1 and below) for the 2020/21 season meaning London 3 South West was not contested.
United Services Portsmouth who finished 5th in 2018-19 were unable to fulfil their fixtures in and withdrew from the league in November 2019.
When this division was introduced in 2000 (as London 4 South West) it contained the following teams:
Originally known as London 4 South West, this division was a tier 8 league with promotion up to London 3 South West and relegation down to either Hampshire 1 or Surrey 1.
League restructuring by the RFU ahead of the 2009âÂÂ10 season saw London 4 South West renamed as London 3 South West. Remaining as a tier 8 league promotion was to London 2 South West (formerly London 3 South West), while relegation continued to either Hampshire 1 or Surrey 1.