Class 4

Class 4 may refer to:


 * British Rail Class 04, British diesel shunting locomotive
 * BR Standard Class 4 4-6-0, British steam locomotive
 * BR Standard Class 4 2-6-0, British steam locomotive
 * BR Standard Class 4 2-6-4T, British steam locomotive
 * Class 4 telephone switch
 * Class 4, contribution class in the National Insurance system in the UK.
 * NSB Class IV, Norwegian narrow-gauge steam locomotive
 * NSB El 4, Norwegian electric locomotive
 * NSB Di 4, Norwegian diesel locomotive
 * SCORE Class 4, off-road racing vehicles
 * Speed Class Rating, official unit of speed measurement for SD Cards
 * TS Class 4, a tram used in Trondheim, Norway
 * Class 4 truck, US truck class for medium trucks, up to 16,000 pounds weight limit
 * The fourth class in terms of hiking difficulty in the Yosemite Decimal System
 * Missouri Class 4 city