The 1988–89 Sussex County Football League season was the 64th in the history of Sussex County Football League a football competition in England.[1] [2]
| Competition: | Sussex County Football League Division One |
| Season: | 1988–89 |
| Winners: | Pagham |
| Relegated: | Oakwood Portfield |
| Matches: | 306 |
| Total Goals: | 905 |
| Prevseason: | 1987–88 |
| Nextseason: | 1989–90 |
Division One featured 15 clubs which competed in the division last season, along with three new clubs:
| Competition: | Sussex County Football League Division Two |
| Season: | 1988–89 |
| Winners: | Seaford Town |
| Promoted: | Seaford Town Ringmer |
| Relegated: | East Grinstead |
| Matches: | 182 |
| Total Goals: | 557 |
| Prevseason: | 1987–88 |
| Nextseason: | 1989–90 |
Division Two featured twelve clubs which competed in the division last season, along with two new clubs:
| Competition: | Sussex County Football League Division Three |
| Season: | 1988–89 |
| Winners: | Saltdean United |
| Promoted: | Saltdean United Stamco Franklands Village |
| Matches: | 240 |
| Total Goals: | 754 |
| Prevseason: | 1987–88 |
| Nextseason: | 1989–90 |
Division Three featured twelve clubs which competed in the division last season, along with four new clubs: