Class 70 or 70 class may refer to:
Australia New South Wales 70 class locomotive, diesel-hydraulic locomotives
Germany DRG Class 70, a class of German passenger locomotive with a 2-4-0T wheel arrangement operated by the Deutsche Reichsbahn and comprising the: DRG Class 70.0: Bavarian Pt 2/3 DRG Class 70.1: Baden I g DRG Class 70.2: ELE T 4 DR Class 70.61, DR Class 70.63 and DR Class 70.64 : locomotives taken over by the Deutsche Reichsbahn (GDR) in East Germany in 1949 DRG Class 70.71: Bavarian D IX
Philippines Manila Railway 70 class, 0-6-2 steam locomotives
United Kingdom British Rail Class 70 (electric), electric locomotives built by the Southern Railway in the 1940s British Rail Class 70, diesel locomotives built by GE Transportation in the 2000s