Class 01 may refer to:

• British Rail Class 01, a class of post-war British 0-4-0 diesel locomotive designed for use on tight curves and limited clearances
• British Rail Class 01/5, encompasses a variety of privately owned shunting locomotives
• DRG Class 01, a class of German standard steam locomotive designed between the wars for express train services
  • DRG Class 01.10, a later, more powerful version of the DRG Class 01 above first delivered in 1939
• Class 01, in the electrical Appliance classes

• Class 1 (disambiguation)
• Class I (disambiguation)

This disambiguation page lists articles associated with the title Class 01.
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