The 1979–80 season was the ninth in the history of Essex Senior Football League, a football competition in England.[1]
The league featured 14 clubs which competed in the league last season, along with two new clubs:
Basildon United were champions, winning their fourth Essex Senior League title in a row.
| Competition: | Essex Senior Football League |
| Season: | 1979–80 |
| Winners: | Basildon United |
| Matches: | 240 |
| Total Goals: | 650 |
| Prevseason: | 1978–79 |
| Nextseason: | 1980–81 |