During the 2008–09 English football season, West Bromwich Albion competed in the Premier League, following promotion from the Football League Championship as Football League champions the previous season.

West Bromwich began the season strongly with ten points from their opening seven games leaving them in midtable, but that proved to be as good as it got for the Midlanders and with only five more league wins during the rest of the season Albion soon sunk to the foot of the Premier League and were relegated in last place. At the end of the season, manager Tony Mowbray left to take charge at Celtic; he was replaced by MK Dons manager Roberto Di Matteo.

West Bromwich retained their kit sponsorship deal with English company Umbro, who introduced both a new home kit and a new away kit with navy shorts and yellow shirts and socks. The club was unable to find a kit sponsor for the season, and so became the first club in Premier League history to go a season without any kit sponsorship.

Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.

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