The 1973–74 Sussex County Football League season was the 49th in the history of Sussex County Football League a football competition in England.[1] [2]
| Competition: | Sussex County Football League Division One |
| Season: | 1973–74 |
| Winners: | Newhaven |
| Relegated: | Shoreham Rye United |
| Matches: | 210 |
| Total Goals: | 597 |
| Prevseason: | 1972–73 |
| Nextseason: | 1974–75 |
Division One featured 13 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: | 1973–74 |
| Winners: | Wigmore Athletic |
| Promoted: | Wigmore Athletic Three Bridges |
| Matches: | 110 |
| Total Goals: | 361 |
| Prevseason: | 1972–73 |
| Nextseason: | 1974–75 |
Division Two featured nine clubs which competed in the division last season, along with two new clubs, relegated from Division One: