The 1989–90 Combined Counties Football League season was the 12th in the history of the Combined Counties Football League, a football competition in England.
The league was won by Chipstead for the first time.
| Competition: | Combined Counties Football League |
| Season: | 1989–90 |
| Winners: | Chipstead |
| Promoted: | Cove |
| Matches: | 306 |
| Total Goals: | 1010 |
| Prevseason: | 1988–89 |
| Nextseason: | 1990–91 |
The league was reduced to 18 clubs from 19 after Malden Vale were promoted to the Isthmian League, and no new clubs joined: