30th Battalion

30th Battalion may refer to:


 * 30th Battalion (Australia), a unit of the Australian Army raised for service during World War I
 * 2/30th Battalion (Australia), a unit of the Australian Army raised for service during World War II
 * 30th Battalion, CEF, a unit of the Canadian Expeditionary Force raised for service during World War I
 * 30th Battalion, Bengal Native Infantry, an infantry unit of the British Indian Army
 * 30th Battalion (New Zealand), a World War II infantry battalion