The 2009–10 season was Blackburn Rovers' 122nd season as a professional football club. The 2009–10 season was Blackburn Rovers' 16th season in the Premier League, and their 9th consecutive season in the top division of English football.

The end of the previous season saw the departure of first-team squad players. André Ooijer,Aaron Mokoena and Tugay Kerimoğlu all left the club on free transfers. With that in mind, Sam Allardyce wasted no time in bringing new additions into the club, with the signing of the South African international winger Elrio Van Heerden from Club Brugge on 2 June on a free transfer.

A few weeks later, Roque Santa Cruz signed for Manchester City, ending 12 months of speculation. Two days later, Matt Derbyshire completed a move to Olympiacos, where he had been on loan since January 2009. With the incoming cash, Blackburn quickly move to secure Gaël Givet to a permanent contract following his successful loan spell from Marseille in the second half of the prior season.

He was swiftly followed into Ewood Park by another free transfer, right-back Lars Jacobsen, who had been released from Everton following two years plagued by injury, and Steven N'Zonzi, a central midfielder who joined from French club Amiens for an undisclosed fee.

With the departure of two strikers and the lack of depth shown up front the prior season by being forced to play Christopher Samba as a striker for the most part, the attention was then shifted to strengthening the frontline. After being linked to numerous big-name strikers such as Bojan,Ruud van Nistelrooy and Christian Vieri throughout the summer, Blackburn finally secured the signings of Franco Di Santo on loan and the permanent signing of Croatian striker Nikola Kalinić in early August. Due to the arrival of two new strikers, Paul Gallagher was allowed to leave the club, joining Championship side Leicester City in order to play regular first-team football.

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