21st Army Corps
Country	Russian Empire
Allegiance	Imperial Russian Army
Engagements	World War I Gorlice–Tarnów Offensive

The 21st Army Corps was an Army corps in the Imperial Russian Army. Their headquarters are in Kiev.^[1]

Composition

• 33rd Infantry Division^[1]
• 44th Infantry Division^[1]

Part of

• 3rd Army: 1914 - 1915
• 8th Army: 1915
• 2nd Army: 1915
• 5th Army: 1915 - 1916
• 12th Army: 1916 - 1917
• 4th Army: 1917

Commanders

• 1906-1909: Nikolai Ruzsky
• 1914-1915: Yakov Schkinsky
• sept 1917: Nikolai Bredov