3rd Brigade

In military terms, 3rd Brigade may refer to:

Australia

 * 3rd Army Tank Brigade (Australia)
 * 3rd Brigade (Australia)
 * 3rd Light Horse Brigade

Croatia

 * 3rd Guards Brigade (Croatia)

France

 * 3rd Mechanised Brigade (France)

Japan

 * IJA 3rd Cavalry Brigade

Poland

 * 3rd Brigade of the Polish Legions
 * 3rd Polish Infantry Brigade
 * Polish 3rd Mountain Brigade

Serbia

 * LF 3rd Brigade

South Africa

 * 3rd Infantry Brigade (South Africa)

United Kingdom

 * 3rd Cavalry Brigade (United Kingdom)
 * 3 Commando Brigade
 * 3rd Infantry Brigade (United Kingdom)
 * 3rd Mounted Brigade (United Kingdom)
 * 3rd Parachute Brigade (United Kingdom)

United States

 * 3rd Brigade, 1st Infantry Division (United States)
 * 3rd Brigade, 1st Cavalry Division (United States)
 * 3rd Brigade, 7th Infantry Division (United States)
 * 3rd Brigade Combat Team, 10th Mountain Division (United States)
 * 3rd Brigade, 24th Infantry Division (United States)
 * 3rd Brigade, 104th Division (United States)
 * 3rd Marine Expeditionary Brigade (United States)
 * 3rd Signal Brigade (United States)
 * 3rd Sustainment Brigade (United States)