G class or Class G may refer to:
Railways Commonwealth Railways G class, a class of 4-6-0 steam locomotive used in Australia MRWA G class, a class of diesel locomotive used in Australia NBR G Class, a class of steam locomotive used in the United Kingdom NZR G class (1874), a type of steam locomotive used in New Zealand NZR G class (1928), a type of steam locomotive used in New Zealand Tasmanian Government Railways G class, a class of 0-4-2T steam locomotive used in Australia Victorian Railways G class, a class of 2-6-0+0-6-2 steam locomotives Victorian Railways G class (1877), a class of 4-4-0 steam locomotives V/Line G class, a class of diesel-electric locomotives SECR G class, a class of 4-4-0 steam locomotives Two types of diesel locomotives used by Córas Iompair Éireann: CIÉ 601 Class CIÉ 611 Class Australian Standard Garratt Metropolitan Railway G Class, a class of 0-6-4T steam locomotives South Australian Railways G class, a class of 2-4-0 steam locomotives Victorian Railways G class, a class of narrow gauge locomotives G-class Melbourne tram G-class Sydney tram WAGR G class, a class of 2-6-0 steam locomotives operated by the Western Australian Government Railways
Ships G-class destroyer (disambiguation), several classes of ships G-class frigate, one of the frigate classes of the Turkish Navy G-class landing craft, a vessel in use by the Finnish Navy and the Swedish Navy G-class submarine (disambiguation), several classes of ships OOCL G-class container ship, a class of very large container ships.
Other uses Class G, a class of airspace in various airspace classification systems G-class blimp, a type of blimp built in America from 1935 Class G, a spectral class for stars Class G amplifier, a class of electronic amplifiers usually used in high-power audio applications Mercedes-Benz G-Class, a luxury SUV (sport utility vehicle) Short G-class, a transport flying-boat Google Classroom