| Founded | 1995 |
|---|---|
| No. of teams | 12 |
| Country | Wales |
| Most recent champion(s) | Maesteg Harlequins RFC (2011–12) |
| Level on pyramid | 4 |
| Promotion to | WRU Division Two West |
| Relegation to | WRU Division Four South West |
| Official website | www |
The Welsh Rugby Union Division Three South West (also called the SWALEC Division Three South West for sponsorship reasons) is a rugby union league in Wales.