Class 30

Class 30 may refer to:
 * The original designation of the British Rail Class 31 diesel-electric locomotive
 * EAR 30 class, East African 2-8-4 steam locomotive
 * New South Wales C30 class locomotive, Australian 4-6-4T steam locomotive
 * L&YR Class 30 (disambiguation), various steam locomotives
 * NSB Class 30, Norwegian 4-6-0 steam locomotive