The 2009 Football League One play-off final was an association football match which was played on 24 May 2009 at Wembley Stadium, London, between Millwall and Scunthorpe United to determine the third and final team to gain promotion from Football League One to the Football League Championship. The top two teams of the 2008–09 Football League One season, Leicester City and Peterborough United, gained automatic promotion to the Championship, while those placed from third to sixth in the table took part in play-off semi-finals. The winners of these semi-finals competed for the final place for the 2009–10 season in the Championship. The losing semi-finalists were Milton Keynes Dons and Leeds United.