Stalag XXI-D was a German World War II prisoner-of-war camp based in Poznań in German-occupied Poland, operated in 1940–1945.

It held Polish, French, British, Belgian, Dutch, Serbian, Soviet and Italian POWs.

;[4] The fort still stands, located to the south of Stadion Miejski, home to Lech Poznań football club.

Despite the distance, administration of the work camp at Łódź fell under Stalag XXI-D for part of the war.

[12] The German Army training area at Biedrusko a few miles north of Poznan, was the location of a PoW working camp between July 1940 and June 1942.

[14] British prisoners-of-war who died in the camp were later buried at a cemetery of the Commonwealth War Graves Commission in Poznań.