Australia

• 4th Brigade (Australia)
• 4th Armoured Brigade (Australia)
• 4th Light Horse Brigade
  4th Light Horse Brigade
  The 4th Light Horse Brigade was a mounted infantry brigade of the First Australian Imperial Force serving in the Middle Eastern theatre of World War I. The brigade was formed in March 1915 and shipped to Egypt without their horses and was broken up in Egypt in August 1915...
  
  

Canada

• 4th Canadian Armoured Brigade
  4th Canadian Armoured Brigade
  As of 1942 the 4th Canadian Armoured Brigade comprised:* 21st Armoured Regiment * 22nd Armoured Regiment * 28th Armoured Regiment...
  
  
• 4th Canadian Infantry Brigade
  4th Canadian Infantry Brigade
  The 4th Canadian Infantry Brigade was a brigade of the Canadian Army during the Second World War.-History:It was mobilized on 1 September 1939 part of 2nd Canadian Infantry Division , even before the declaration of war, and the battalions were promptly fleshed out by volunteers...
  
  
• 4th Infantry Brigade (Canada)
  4th Infantry Brigade (Canada)
  The 4th Infantry Brigade was a First World War Canadian Army brigade. It was part of the 2nd Canadian Division.- World War I History :...
  
  

United Kingdom

• 4th Armoured Brigade  - 1939 - 1945
• 4th Cavalry Brigade (United Kingdom)
  4th Cavalry Brigade (United Kingdom)
  The 4th Cavalry Brigade was formation of Regiments of the British Army during the First World War, which was formed again in 1939 from Yeomanry Regiments for service during the Second World War...
  
  
• 4th Infantry Brigade (United Kingdom)
• 4th London Infantry Brigade
• 4th Mechanized Brigade (United Kingdom)
• 4th Parachute Brigade (United Kingdom)
• 4th Special Service Brigade
  4th Special Service Brigade
  The 4th Special Service Brigade was created in March 1944 from units of the Royal Marines. Due to the success of the Army Commandos’ operations in Norway, the Channel Islands, St...
  
  

United States

• 4th Brigade, 1st Armored Division (United States)
• 4th Brigade, 1st Cavalry Division (United States)
• 4th Brigade, 1st Infantry Division (United States)
• 4th Brigade Combat Team, 2nd Infantry Division (United States)
• 4th Brigade Combat Team, 10th Mountain Division (United States)
  4th Brigade Combat Team, 10th Mountain Division (United States)
  The 4th Brigade Combat Team, 10th Mountain Division is a mountain warfare infantry Brigade Combat Team of the United States Army based at Fort Polk, Louisiana...
  
  
• 4th Brigade, 104th Division (United States)
  4th Brigade, 104th Division (United States)
  The 4th Brigade, 104th Division is an infantry brigade of the United States Army. It is a training component of the United States Army Reserve, and subordinate to the 104th Division based in Fort Lewis, Washington...
  
  
• 4th Cavalry Brigade (United States)
  4th Cavalry Brigade (United States)
  The 4th Cavalry Brigade is an AC/RC unit based at Fort Knox, Kentucky. The unit is responsible for training selected United States Army Reserve & National Guard units that are based East of the Mississippi River. The brigade was originally formed as an element of the 2nd Cavalry Division but was...
  
  
• 4th Sustainment Brigade (United States)
  4th Sustainment Brigade (United States)
  The 4th Sustainment Brigade is a sustainment brigade of the United States Army. It previously provided logistical support to the 4th Infantry Division, but is now supporting the 1st Cavalry Division...