90th Brigade may refer to:
British India 90th Indian Infantry Brigade
Spain 90th Mixed Brigade, see
United Kingdom 90th Brigade (United Kingdom) 90th Brigade, Royal Field Artillery, British Army unit in World War I 90th (City of London) Brigade, Royal Field Artillery, British Army unit after World War I
United States 90th Sustainment Brigade 90th Troop Command, a brigade-sized unit
See also 90th Division (disambiguation) 90th Regiment (disambiguation)