The 2013–14 Sussex County Football League season was the 89th in the history of Sussex County Football League, a football competition in England playing at Levels 9-11 in the English football league pyramid.
| Competition: | Sussex County Football League Division One |
| Season: | 2013–14 |
| Winners: | East Preston |
| Relegated: | Worthing United |
| Matches: | 380 |
| Total Goals: | 1309 |
| Prevseason: | 2012–13 |
| Nextseason: | 2014–15 |
Division One featured 18 clubs which competed in the division last season, along with two new clubs, promoted from Division Two:
East Preston have won the league but cannot be promoted after failing to meet the ground grading for Step 4.
| Competition: | Sussex County Football League Division Two |
| Season: | 2013–14 |
| Winners: | Eastbourne United |
| Promoted: | Eastbourne United Broadbridge Heath Loxwood |
| Matches: | 272 |
| Total Goals: | 1046 |
| Prevseason: | 2012–13 |
| Nextseason: | 2014–15 |
Division Two featured 15 clubs which competed in the division last season, along with two new clubs:
Also, Wick merged with Division Three club Barnham to create Wick & Barnham United.
| Competition: | Sussex County Football League Division Three |
| Season: | 2013–14 |
| Winners: | Langney Wanderers |
| Matches: | 110 |
| Total Goals: | 400 |
| Prevseason: | 2012–13 |
| Nextseason: | 2014–15 |
Division Three featured nine clubs which competed in the division last season, along with two new clubs: