The 2009–10 Hellenic Football League season was the 57th in the history of the Hellenic Football League, a football competition in England.
| Competition: | Hellenic Football League Premier Division |
| Season: | 2009–10 |
| Winners: | Almondsbury Town |
| Promoted: | Almondsbury Town |
| Relegated: | Bicester Town Hook Norton |
| Matches: | 462 |
| Total Goals: | 1673 |
| Prevseason: | 2008–09 |
| Nextseason: | 2010–11 |
Premier Division featured 18 clubs which competed in the division last season, along with four new clubs:
| Competition: | Hellenic Football League Division One East |
| Season: | 2009–10 |
| Winners: | Thame United |
| Promoted: | Thame United Wokingham & Emmbrook |
| Matches: | 272 |
| Total Goals: | 943 |
| Prevseason: | 2008–09 |
| Nextseason: | 2010–11 |
Division One East featured 14 clubs which competed in the division last season, along with four clubs:
Also, Bisley changed name to Farnborough reserves.
| Competition: | Hellenic Football League Division One West |
| Season: | 2009–10 |
| Winners: | Slimbridge |
| Promoted: | Slimbridge Wootton Bassett Town |
| Matches: | 240 |
| Total Goals: | 906 |
| Prevseason: | 2008–09 |
| Nextseason: | 2010–11 |
Division One West featured 13 clubs which competed in the division last season, along with four new clubs: