Class 34 or 34 class may refer to:
Passenger train, tender locomotives with a 2-4-0 wheel arrangement operated by the Deutsche Reichsbahn: Class 34.70: BBÖ 231 (locomotive with 0-6-0 wheel arrangement) Class 34.73: Mecklenburg P 3.1 Class 34.76: Saxon III Class 34.77–78: Saxon IIIb Class 34.79: Saxon IIIb V Class 34.80: Saxon VIb V Class 34.81: Württemberg A Class 34.82: Württemberg Ac New South Wales 34 class locomotive