The 1921–22 Football League season was Birmingham Football Club's 26th in the Football League and their 9th in the First Division, having been promoted as Second Division champions in 1920–21. They retained their First Division status, finishing in 18th position in the 22-team division.

They did not take part in the 1921–22 FA Cup. Secretary-manager Frank Richards failed to submit their entry form in time to be granted exemption from qualifying, and the Football Association refused to bend the rules in their favour. Although that decision did not preclude their entering the competition in the qualifying rounds, the directors chose not to do so.

Thirty-one players made at least one appearance in nationally organised first-team competition, and there were twelve different goalscorers. Goalkeeper Dan Tremelling played in 39 matches over the 42-match season; among outfield players, half-back Alec McClure appeared in 35. Joe Bradford and Johnny Crosbie were joint leading scorers with 10 goals.

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