33rd Battalion

33rd Battalion or 33rd Infantry Battalion may refer to:


 * 33rd Battalion (Australia), a unit of the Australian Army
 * 2/33rd Battalion (Australia), a unit of the Australian Army that served during World War II
 * 33rd Battalion, CEF, a unit of the Canadian Expeditionary Force during World War I
 * 33 Battalion (SWATF), a unit of the South West Africa Territorial Force
 * Reserve Police Battalion 33, an auxiliary unit of the Third Reich
 * Schutzmannschaft Battalion 33, an auxiliary unit of the Third Reich
 * 33rd Battalion Virginia Cavalry