The 1986–87 season was the 45th in the history of Eastern Counties Football League a football competition in England.[1]
The league featured 22 clubs which competed in the league last season, along with one new club:
Sudbury Town were champions for the second season in a row, winning their fifth Eastern Counties Football League title, while Bury Town, who finished third were promoted to the Southern Football League, returning after eleven seasons in the Eastern Counties League.
| Competition: | Eastern Counties Football League |
| Season: | 1986–87 |
| Winners: | Sudbury Town |
| Promoted: | Bury Town |
| Matches: | 506 |
| Total Goals: | 1612 |
| Prevseason: | 1985–86 |
| Nextseason: | 1987–88 |