21st Army From Wikipedia the free encyclopedia 21st Army may refer to: 21st Army (Wehrmacht) 21st Army (Soviet Union) Twenty-First Army (Japan) 21st Army Group, Britain 21st Group Army, China Topics referred to by the same termThis disambiguation page lists articles about military units and formations which are associated with the same title. If an internal link referred you to this page, you may wish to change the link to point directly to the intended article.