| Competition: | Western Football League |
| Season: | 1990–91 |
| Winners: | Mangotsfield United (Premier Division) Minehead (Division One) |
| Prevseason: | 1989–90 |
| Nextseason: | 1991–92 |
The 1990–91 season was the 89th in the history of the Western Football League.
The league champions for the first time in their history were Mangotsfield United. The champions of Division One were Minehead after finishing bottom the previous season.[1]
The Premier Division remained at 21 clubs after Swanage Town & Herston transferred to the Wessex League. One club joined:
The First Division was increased from 20 clubs to 21, after Ottery St Mary were promoted to the Premier Division. Two new clubs joined: