99th Brigade may refer to:
Afghanistan 99th Missile Brigade
Bangladesh 99th Composite Brigade
India 99th Mountain Brigade, formerly 99th Indian Infantry Brigade
Iraq 99th Brigade (Iraq)
Spain 99th Mixed Brigade, see
United Kingdom 99th Brigade (United Kingdom) 99th Brigade, Royal Field Artillery, a British Army unit during World War I 99th (Buckinghamshire and Berkshire) Brigade, Royal Field Artillery, a British Army unit after World War I
See also 99th Division (disambiguation) 99th Regiment (disambiguation)