Z-class may refer to:

South Australian Railways Z class, a class of steam locomotive SR Z Class, a class of steam locomotive built by the Southern Railway in the United Kingdom Tasmanian Government Railways Z class, a class of diesel locomotive built by English Electric in Australia Victorian Railways Z class, a class of steam locomotive built in Victoria, Australia WAGR Z class, a class of diesel-mechanical locomotives of the Western Australian Government Railways W and Z-class destroyer, a class of destroyers of the Royal Navy launched in 1943–1944 Z-Class Melbourne Tram, a single bogie electric tram used in Australia Z-class torpedo boat, a class of warships originating from the Royal Netherlands Navy Zeddie, or Z Class, New Zealand sailing dinghy