The 1990–91 Combined Counties Football League season was the 13th in the history of the Combined Counties Football League, a football competition in England.
The league was won by Farnham Town for the first time. There was no promotion this season.
| Competition: | Combined Counties Football League |
| Season: | 1990–91 |
| Winners: | Farnham Town |
| Matches: | 272 |
| Total Goals: | 894 |
| Prevseason: | 1989–90 |
| Nextseason: | 1991–92 |
The league was reduced to 17 clubs from 18 after Cove were promoted to the Isthmian League, and Weybridge Town and Chobham left the league. Two new clubs joined: