120th Brigade may refer to:
Belarus 120th Guards Mechanised Brigade of the Belarusian Ground Forces
Egypt 120th Infantry Brigade (Egypt), part of the Operation Badr (1973) order of battle
Japan 120th Independent Mixed Brigade, part of the Fifty-Fourth Army (Japan)
Russia 120th Artillery Brigade (Russia), of the Siberian Military District of the Russian Ground Forces
Ukraine 120th Territorial Defense Brigade, a unit of the Ukrainian Territorial Defense Forces
United Kingdom 120th Brigade (United Kingdom) 120th Brigade, Royal Field Artillery, a British Army unit 1915–16
United States 120th Infantry Brigade (United States) of the US Army
See also 120th Division (disambiguation) 120th Regiment (disambiguation)