The 1972–73 Sussex County Football League season was the 48th in the history of Sussex County Football League a football competition in England.[1] [2]
| Competition: | Sussex County Football League Division One |
| Season: | 1972–73 |
| Winners: | Chichester City |
| Relegated: | Burgess Hill Town Three Bridges |
| Matches: | 210 |
| Total Goals: | 566 |
| Prevseason: | 1971–72 |
| Nextseason: | 1973–74 |
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: | 1972–73 |
| Winners: | Portfield |
| Promoted: | Portfield Shoreham |
| Matches: | 156 |
| Total Goals: | 522 |
| Prevseason: | 1971–72 |
| Nextseason: | 1973–74 |
Division Two featured twelve clubs which competed in the division last season, along with one new club, relegated from Division One: