The 1988–89 Combined Counties Football League season was the 11th in the history of the Combined Counties Football League, a football competition in England.
The league was won by British Aerospace (Weybridge) for the fourth time, and for the third time in four seasons.
| Competition: | Combined Counties Football League |
| Season: | 1988–89 |
| Winners: | British Aerospace (Weybridge) |
| Promoted: | Malden Vale |
| Matches: | 342 |
| Total Goals: | 1094 |
| Prevseason: | 1987–88 |
| Nextseason: | 1989–90 |
The league was increased from 18 clubs to 19 after one new club joined: