12th Brigade or 12th Infantry Brigade may refer to:

• 12th Jungle Brigade (Argentina)

• 12th Brigade (Australia)

• 12th Cavalry Brigade (British Indian Army) of the British Indian Army in the First World War, distinct from the one below
• 12th Indian Cavalry Brigade of the British Indian Army in the First World War, distinct from the one above
• 12th Indian Brigade of the British Indian Army in the First World War
• 12th Indian Infantry Brigade of the British Indian Army in the Second World War

• Negev Brigade

• 12th Brigade (Japan)

• XII International Brigade

• 12th Mechanised Brigade (United Kingdom)
• 12th Mounted Brigade (United Kingdom)
• Artillery Brigades
  • 12th (Howitzer) Brigade Royal Field Artillery
  • XII Brigade, Royal Horse Artillery

• 12th Combat Aviation Brigade (United States)