21st Brigade

In military terms, 21st Brigade may refer to:

Australia

 * 21st Brigade (Australia)

Germany

 * 21st Panzer Brigade (Bundeswehr)

Greece

 * 21st Armoured Brigade (Greece)
 * 21st Brigade (Greece)

India

 * 21st Indian Infantry Brigade

Ukraine

 * 21st Mechanized Brigade (Ukraine)

United Kingdom

 * 21st Army Tank Brigade
 * 21st Brigade (United Kingdom)
 * 21st Mounted Brigade (United Kingdom)