The 1978–79 Sussex County Football League season was the 54th in the history of Sussex County Football League a football competition in England.[1] [2]
| Competition: | Sussex County Football League Division One |
| Season: | 1978–79 |
| Winners: | Peacehaven & Telscombe |
| Relegated: | East Grinstead Sidley United |
| Matches: | 240 |
| Total Goals: | 742 |
| Prevseason: | 1977–78 |
| Nextseason: | 1979–80 |
Division One featured 14 clubs which competed in the division last season, along with two new clubs, promoted from Division Two:
| Competition: | Sussex County Football League Division Two |
| Season: | 1978–79 |
| Winners: | Pagham |
| Promoted: | Pagham Portfield |
| Matches: | 182 |
| Total Goals: | 542 |
| Prevseason: | 1977–78 |
| Nextseason: | 1979–80 |
Division Two featured twelve clubs which competed in the division last season, along with two new clubs relegated from Division One: