30th Brigade or 30th Infantry Brigade may refer to:
- 30th Brigade (Australia), an infantry unit of the Australian Army
- 30th Mechanized Infantry Brigade (Greece), a unit of the Greek Army
- 30th Indian Brigade of the British Indian Army in the First World War
- 30th Indian Infantry Brigade of the British Indian Army in the Second World War
- 30th Mixed Brigade, a unit of the Spanish Republican Army in the Spanish Civil War
- 30th Mechanized Brigade (Ukraine), a unit of the Ukrainian Ground Forces
- 30th Armored Brigade Combat Team, a unit of the United States Army
Units of the United Kingdom: