The 1983–84 Sussex County Football League season was the 59th in the history of Sussex County Football League a football competition in England. It also was the first season for the league to consist of three divisions.[1] [2]
| Competition: | Sussex County Football League Division One |
| Season: | 1983–84 |
| Winners: | Whitehawk |
| Relegated: | Pagham |
| Matches: | 240 |
| Total Goals: | 771 |
| Prevseason: | 1982–83 |
| Nextseason: | 1984–85 |
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: | 1983–84 |
| Winners: | Portfield |
| Promoted: | Portfield Arundel |
| Relegated: | Crowborough Athletic |
| Matches: | 240 |
| Total Goals: | 779 |
| Prevseason: | 1982–83 |
| Nextseason: | 1984–85 |
Division Two featured 13 clubs which competed in the division last season, along with three new clubs:
| Competition: | Sussex County Football League Division Three |
| Season: | 1983–84 |
| Winners: | East Preston |
| Promoted: | Franklands Village Ferring |
| Matches: | 156 |
| Total Goals: | 483 |
| Nextseason: | 1984–85 |