The 1984–85 United Counties League season was the 78th in the history of the United Counties League, a football competition in England.
| Competition: | United Counties League Premier Division |
| Season: | 1984–85 |
| Winners: | Arlesey Town |
| Matches: | 380 |
| Total Goals: | 1198 |
| Prevseason: | 1983–84 |
| Nextseason: | 1985–86 |
The Premier Division featured 18 clubs which competed in the division last season, along with two new clubs:
| Competition: | United Counties League Division One |
| Season: | 1984–85 |
| Winners: | Northampton Spencer |
| Promoted: | Northampton Spencer |
| Matches: | 240 |
| Total Goals: | 765 |
| Prevseason: | 1983–84 |
| Nextseason: | 1985–86 |
Division One featured 15 clubs which competed in the division last season, along with one new club: