The 2002–03 season was the 61st in the history of Eastern Counties Football League a football competition in England.[1]
AFC Sudbury were champions, winning their third Eastern Counties Football League title in a row after the new club was formed in 1999.
| Competition: | Eastern Counties Football League Premier Division |
| Season: | 2002–03 |
| Winners: | AFC Sudbury |
| Relegated: | Ely City Harwich & Parkeston Ipswich Wanderers |
| Matches: | 506 |
| Total Goals: | 1696 |
| Prevseason: | 2001–02 |
| Nextseason: | 2003–04 |
The Premier Division featured 20 clubs which competed in the division last season, along with three new clubs:
| Competition: | Eastern Counties Football League Division One |
| Season: | 2002–03 |
| Winners: | Halstead Town |
| Promoted: | Halstead Town King's Lynn reserves |
| Matches: | 342 |
| Total Goals: | 1182 |
| Prevseason: | 2001–02 |
| Nextseason: | 2003–04 |
Division One featured 15 clubs which competed in the division last season, along with four new clubs: