The 1990–91 Football League season was Birmingham City Football Club's 88th in the Football League and their second in the Third Division. They finished in 12th position in the 24-team division. They entered the 1990–91 FA Cup in the first round proper and lost to Brentford in the second, and entered at and lost in the first round of the League Cup, beaten over two legs by AFC Bournemouth. They won the Football League Trophy, a cup competition open to clubs in the third and fourth tiers of the English football league system, defeating Tranmere Rovers 3–2 in the final at Wembley Stadium with goals from Simon Sturridge and two from John Gayle.

Off the field, Dave Mackay resigned as manager in January 1991, to be replaced by Lou Macari on a non-contract basis. With the club in financial difficulties, Macari and his staff walked out of the club in June to join Stoke City.

When I took over the Birmingham job without any contract, things were so bad the chairman asked me to raise £250,000 by the end of the season. It looked impossible, but the revenue was delivered with the great run in the Leyland Daf. It's no secret that, if we hadn't got to Wembley, Birmingham would have been in financial trouble and might have gone under.

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