The 2003–04 Sussex County Football League season was the 79th in the history of Sussex County Football League a football competition in England.[1] [2]
| Competition: | Sussex County Football League Division One |
| Season: | 2003–04 |
| Winners: | Chichester City United |
| Relegated: | Selsey Shoreham |
| Matches: | 342 |
| Total Goals: | 1099 |
| Prevseason: | 2002–03 |
| Nextseason: | 2004–05 |
Division One featured 16 clubs which competed in the division last season, along with four new clubs.
St Leonards resigned from the league January 2004 and their playing record of P21 W7 D4 L10 GF32 GA35 P25 was expunged.
| Competition: | Sussex County Football League Division Two |
| Season: | 2003–04 |
| Winners: | Littlehampton Town |
| Promoted: | Littlehampton Town Worthing United Eastbourne United Association |
| Relegated: | Haywards Heath Town |
| Matches: | 306 |
| Total Goals: | 1013 |
| Prevseason: | 2002–03 |
| Nextseason: | 2004–05 |
Division Two featured 12 clubs which competed in the division last season, along with six new clubs.
| Competition: | Sussex County Football League Division Three |
| Season: | 2003–04 |
| Winners: | Crowborough Athletic |
| Promoted: | Crowborough Athletic St Francis Rangers |
| Matches: | 182 |
| Total Goals: | 702 |
| Prevseason: | 2002–03 |
| Nextseason: | 2004–05 |
Division Three featured 13 clubs which competed in the division last season, along with one new club:
Also, Ifield merged with Edwards Sports to form Ifield Edwards.