Class 20

Class 20 may refer to:


 * British Rail Class 20
 * GER Class D81, later LNER Class J20
 * JNR Class B20
 * JŽ class 20
 * NER Class R, later LNER Class D20
 * New South Wales Z20 class locomotive
 * SNCB Class 20
 * South African Class 20 2-10-2
 * South African Class 20E
 * Soviet locomotive class AA20
 * U-20-class submarine