The Q Class is a type of 0-6-0 steam locomotive designed by Richard Maunsell of the Southern Railway and constructed immediately prior to the Second World War for use on medium-distance freight trains throughout the network.

Twenty locomotives were built by Maunsell's successor, Oliver Bulleid, in 1938. The design was relatively old-fashioned, and the class was soon afterwards eclipsed by Bulleid's own more powerful Q1 class. Nevertheless, the locomotives performed adequately and reliably on the tasks for which they had been designed, until their withdrawal in 1965.

Only one has survived into preservation.