The 2005–06 United Counties League season was the 99th in the history of the United Counties League, a football competition in England.
| Competition: | United Counties League Premier Division |
| Season: | 2005–06 |
| Winners: | Woodford United |
| Promoted: | Woodford United |
| Matches: | 462 |
| Total Goals: | 1562 |
| Prevseason: | 2004–05 |
| Nextseason: | 2006–07 |
The Premier Division featured 21 clubs which competed in the division last season, along with one new club:
| Competition: | United Counties League Division One |
| Season: | 2005–06 |
| Winners: | Sleaford Town |
| Promoted: | Wellingborough Town |
| Matches: | 306 |
| Total Goals: | 1086 |
| Prevseason: | 2004–05 |
| Nextseason: | 2006–07 |
Division One featured 16 clubs which competed in the division last season, along with two new clubs:
Also, Eye United changed name to Peterborough Northern Star.