40th Brigade

40th Brigade may refer to:


 * 40th Naval Infantry Brigade, a unit of the Russian Navy
 * 40th Infantry Brigade Combat Team (United States), a unit of the United States Army
 * 40th Tactical Aviation Brigade, an aviation unit of the Ukrainian Air Force
 * United Kingdom
 * 40th Anti-Aircraft Brigade (United Kingdom)
 * 40th Brigade (United Kingdom)
 * Artillery Brigades
 * 40th Brigade Royal Field Artillery