Class 37

Class 37 may refer to:


 * British Rail Class 37, a British diesel locomotive
 * BHP Newcastle 37 class, a class of Australian diesel locomotives
 * LT&SR 37 Class, a class of British tank locomotives
 * DRG Class 37, a class of German steam locomotives with 2-6-0 wheel arrangements operated by the Deutsche Reichsbahn:
 * Class 37.0-1: Prussian P 6
 * Class 37.1-2: PKP Class Oi1
 * Class 37.2: LBE G 6
 * Class 37.3: ČSD Class 344.0
 * Class 37.4: PKP Class Oi101