The 2003–04 United Counties League season was the 97th in the history of the United Counties League, a football competition in England.
| Competition: | United Counties League Premier Division |
| Season: | 2003–04 |
| Winners: | Spalding United |
| Promoted: | Spalding United |
| Matches: | 462 |
| Total Goals: | 1492 |
| Prevseason: | 2002–03 |
| Nextseason: | 2004–05 |
The Premier Division featured 20 clubs which competed in the division last season, along with two new clubs:
| Competition: | United Counties League Division One |
| Season: | 2003–04 |
| Winners: | Potton United |
| Promoted: | Potton United |
| Matches: | 306 |
| Total Goals: | 1117 |
| Prevseason: | 2002–03 |
| Nextseason: | 2004–05 |
Division One featured 15 clubs which competed in the division last season, along with three new clubs: