The 2002–03 Sussex County Football League season was the 78th in the history of Sussex County Football League a football competition in England.[1] [2]
| Competition: | Sussex County Football League Division One |
| Season: | 2002–03 |
| Winners: | Burgess Hill Town |
| Promoted: | Burgess Hill Town |
| Relegated: | Peacehaven & Telscombe Wick Littlehampton Town |
| Matches: | 380 |
| Total Goals: | 1283 |
| Prevseason: | 2001–02 |
| Nextseason: | 2003–04 |
Division One featured 18 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: | 2002–03 |
| Winners: | Rye & Iden United |
| Promoted: | Rye & Iden United Eastbourne Town East Grinstead Town |
| Matches: | 306 |
| Total Goals: | 1013 |
| Prevseason: | 2001–02 |
| Nextseason: | 2003–04 |
Division Two featured 14 clubs which competed in the division last season, along with four new clubs.
| Competition: | Sussex County Football League Division Three |
| Season: | 2002–03 |
| Winners: | Midhurst & Easebourne |
| Promoted: | Midhurst & Easebourne Haywards Heath Town |
| Matches: | 240 |
| Total Goals: | 793 |
| Prevseason: | 2001–02 |
| Nextseason: | 2003–04 |
Division Three featured eleven clubs which competed in the division last season, along with four new clubs:
Also, Bexhill Town changed name to Bexhill United.