The 2009–10 Combined Counties Football League season was the 32nd in the history of the Combined Counties Football League, a football competition in England.
| Competition: | Combined Counties Football League Premier Division |
| Season: | 2009–10 |
| Winners: | North Greenford United |
| Promoted: | North Greenford United |
| Matches: | 462 |
| Total Goals: | 1540 |
| Prevseason: | 2008–09 |
| Nextseason: | 2010–11 |
The Premier Division featured three new teams in a league of 22 teams after the promotion of Bedfont Green to the Southern Football League:
| Competition: | Combined Counties Football League Division One |
| Season: | 2009–10 |
| Winners: | Mole Valley SCR |
| Promoted: | Mole Valley SCR |
| Matches: | 420 |
| Total Goals: | 1577 |
| Prevseason: | 2008–09 |
| Nextseason: | 2010–11 |
Division One featured five new teams in a league of 21 teams: