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
 
See also
- All pages with titles beginning with Class 4
 - All pages with titles containing Class 4
 - Class 04 (disambiguation)
 - Fourth class (disambiguation)
 - Delta class (disambiguation)
 - Type 4 (disambiguation)
 
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