The 2005 Football League One play-off final was an association football match which was played on 29 May 2005 at Millennium Stadium, Cardiff, between Hartlepool United and Sheffield Wednesday. It determined the third and final team to gain promotion from Football League One to the Football League Championship. The top two teams of the 2004–05 Football League One season, Luton Town and Hull City, gained automatic promotion to the Championship, while the teams placed from third to sixth place in the table took part in play-off semi-finals. The winners of these semi-finals competed for the final place for the 2005–06 season in the Championship. The losing semi-finalists were Tranmere Rovers and Brentford.

Hartlepool United Football Club is a professional association football club based in Hartlepool, County Durham, England. The team competes in the National League, the fifth level of the English football league system.