| Club: | Rochdale A.F.C. |
| Season: | 2009–10 |
| Chairman: | Chris Dunphy |
| Stadium: | Spotland Stadium Rochdale, Greater Manchester |
| League: | League Two |
| League Result: | 3rd (promoted) |
| Cup1: | FA Cup |
| Cup1 Result: | First round |
| Cup2: | League Cup |
| Cup2 Result: | First round |
| Cup3: | League Trophy |
| Cup3 Result: | First round |
| League Topscorer: | Chris O'Grady (22 goals) |
| Season Topscorer: | Chris O'Grady (22 goals) |
| Pattern B1: | _blackstripes3 |
| Pattern Sh1: | _bluebottom |
| Pattern So1: | _blacktop |
| Leftarm1: | 0000ff |
| Body1: | 0000ff |
| Rightarm1: | 0000ff |
| Shorts1: | ffffff |
| Socks1: | 0000ff |
| Pattern B2: | _whitesholders |
| Pattern Sh2: | _whitebottom |
| Pattern So2: | _whitetop |
| Leftarm2: | ffffff |
| Body2: | 7f4e96 |
| Rightarm2: | ffffff |
| Shorts2: | 7f4e96 |
| Socks2: | 7f4e96 |
| Pattern Sh3: | _whitebottom |
| Pattern So3: | _whitetop |
| Leftarm3: | ffffff |
| Body3: | ffffff |
| Rightarm3: | ffffff |
| Shorts3: | 7f4e96 |
| Socks3: | 7f4e96 |
| Prevseason: | 2008–09 |
| Nextseason: | 2010–11 |
The 2009–10 Rochdale A.F.C. season was the club's 89th season in the Football League, and the 36th consecutive season in the bottom division of the League. Rochdale finished the season in 3rd place in League Two and won automatic promotion to League One, ending a period of 36 years in the fourth tier.