The 1969–70 Sussex County Football League season was the 45th in the history of Sussex County Football League a football competition in England.[1] [2]
| Competition: | Sussex County Football League Division One |
| Season: | 1969–70 |
| Winners: | Haywards Heath |
| Relegated: | Bognor Regis Town Wadhurst |
| Matches: | 240 |
| Total Goals: | 819 |
| Prevseason: | 1968–69 |
| Nextseason: | 1970–71 |
Division One featured 14 clubs which competed in the division last season, along with two new clubs, promoted from Division Two:
Also, Bexhill Town Athletic changed name to Bexhill Town after parting ways with Bexhill Amateur Athletic Club.
| Competition: | Sussex County Football League Division Two |
| Season: | 1970–71 |
| Winners: | Lancing |
| Promoted: | Lancing APV Athletic |
| Matches: | 210 |
| Total Goals: | 740 |
| Prevseason: | 1968–69 |
| Nextseason: | 1970–71 |
Division Two featured twelve clubs which competed in the division last season, along with three new clubs:
Also, Burgess Hill changed name to Burgess Hill Town.