21st Division

In military terms, 21st Division  or 21st Infantry Division may refer to:


 * Infantry divisions :
 * 21st Infantry Division (France)
 * 21st Division (German Empire)
 * 21st Reserve Division (German Empire)
 * 21st Waffen Mountain Division of the SS Skanderbeg (1st Albanian) (Germany)
 * 21st Infantry Division (Germany)
 * 21st Infantry Division (Philippine Commonwealth Army)
 * 21st Mountain Infantry Division (Poland)
 * 21st Division (United Kingdom)


 * Cavalry Divisions :
 * 21st Cavalry Division (Philippine Commonwealth Army)
 * 21st Cavalry Division (United States)


 * Armoured divisions :
 * 21st Panzer Division (Germany)
 * 21st Armored Division (Philippine Commonwealth Army)


 * Aviation divisions :
 * 21st Air Division (United States)