Q Class or Class Q may refer to:
Rail transport GNRI Class Q, a Great Northern Railway of Ireland locomotive class NZR Q class (1878), a New Zealand Railways locomotive class NZR Q class (1901), a New Zealand Railways locomotive class South Australian Railways Q class, a South Australian Railways locomotive class SR Class Q, a British Southern Railway locomotive class Tasmanian Government Railways Q class, steam locomotive class Victorian Railways Q class, steam locomotive class WAGR Q class, steam locomotive class WAGR Q class (1895), steam locomotive class WAGR Q class (diesel) Q-class Melbourne tram
Other uses Library of Congress Classification:Class Q -- Science Q-class destroyer, a class of warships used by the Royal Navy, Royal Netherlands Navy, and Royal Australian Navy Classical Quarterly, abbreviated Class. Q.