The 2009–10 season was West Bromwich's 107th season in the Football League. West Bromwich returned to the Championship after being relegated from the Premier League.

West Bromwich continued with English company Umbro as the shirt designers. For the second season running, West Bromwich were unable to find a kit sponsor.

West Bromwich began their season with a 1–1 draw against Newcastle United. They then travelled to City Ground to play Nottingham Forest, whom they beat, followed by another away win. West Bromwich's second home game was against Ipswich Town, whom they defeated 2–0. This was followed by a draw at Sheffield United. They then came back from against Plymouth Argyle, then beat Doncaster Rovers. West Bromwich then won one of their most remarkable games in a 5–0 win over Middlesbrough, before losing their next two games to Crystal Palace and Barnsley.

The first game of October saw West Brom draw against Preston North End. This was followed by a 3–1 win over Reading. Former Baggie Craig Beattie scored the only goal in a 1–0 loss to Swansea City. This was followed with a 0–0 draw with Coventry City. The Baggies bounced back by thrashing Watford 5–0. A 2–1 win over Leiecester City kept the Baggies second. The Baggies trashed Bristol City 4–1, and then became the top goalscorers in the Football League when they humiliated Sheffield Wednesday 4–0, scoring 15 goals in 4 games.

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