Somerset 3 South (known as Tribute Somerset 3 South for sponsorship reasons) is an English rugby union league which sits at the eleven level of league rugby union in England alongside its counterpart Somerset 3 North.

1st, 2nd, 3rd and even 4th XV sides can participate in the division as long as they are not from the same club.

The league champions, and occasionally runners up, are promoted to Somerset 2 South and there is no relegation as this is the lowest level of league rugby in Somerset.

The cancellation of National League 5 South at the end of the 1995–96 season meant that Somerset 3 reverted to being a tier 11 league.

From the 2007–08 season onward the league sponsor would be Tribute.