D class may refer to:

Ships

D-class cruiser (Germany) The D-class cruisers were a pair of German heavy cruisers, classified as ("armored ships") by the (Navy of the Realm). The ships were improved versions of the preceding s, authorized by Adolf Hitler in 1933. They were intended to counter a new ...

, a pair of proposed cruisers * D-class cruiser (United Kingdom), British light cruisers that served during World War II * D-class lifeboat, British lifeboats * D-class destroyer (disambiguation), several classes of ships *

British D-class submarine The D-class submarine was the Royal Navy's first class of submarines capable of operating significantly beyond coastal waters. They were also the first boats to be fitted with wireless transmitters. Ten were laid down between 1907 and 1910, tho ...

United States D-class submarine The United States D-class submarines were a trio of submarines built for the United States Navy in the first decade of the 20th century. All three ships served during World War I providing training for crews and officers on the US East Coast, bef ...

D-class ferry The D-class ferries are a trio of RoRo ferries built by Samsung Heavy Industries between 2003 and 2006 and operated by DFDS Seaways. They were originally operated by Norfolkline, and sail between Port of Dover, Dover, United Kingdom and Dunkerque, ...

, roll-on/roll-off ferries operated by DFDS Seaways

Rail vehicles

Australia

* MRWA D class, 2-8-0 type steam locomotives * WAGR D class, 4-6-4T tank locomotive * WAGR D class (1884), 0-4-0ST tank locomotives *

WAGR D class (diesel) The D/DA class are a class of diesel locomotives built by Clyde Engineering, Granville for the Western Australian Government Railways in 1971-1972. History Five D class were ordered by the Western Australian Government Railways to haul bauxite ...

, diesel locomotives *

D-class Melbourne tram The D-class Melbourne tram is a fleet of low-floor Combino trams that operate on the Melbourne tram network. They were built by Siemens in Uerdingen, Krefeld, Germany, and are divided into two classes: the three section D1-class which was introd ...

Sydney D-Class Tram The D-class trams were a class of single bogie Californian Combination type trams operated on the Sydney tram network with open cross benches at the ends and a saloon in the centre. History In 1896, Clyde Engineering delivered car 123 with an e ...

India

DHR D Class The DHR D Class was a gauge Garratt-type articulated steam locomotive used on the Darjeeling Himalayan Railway (DHR) in West Bengal, India. Service history The sole member of the class was built by Beyer, Peacock and Company in 1910, and ente ...

, 0-4-0+0-4-0 Garratt-type articulated steam locomotives

New Zealand

NZR D class (1874) New Zealand Railways Department, NZR D class steam locomotive, steam tank locomotives operated on New Zealand's Rail transport in New Zealand, national railway network. The first entered service in 1874 all had been withdrawn by the end of 1927, ...

, 33 2-4-0T tank locomotives *

NZR D class (1929) The NZR D class of 1929 comprised one 0-4-0 tank locomotive that was built for the New Zealand Railways Department by the Clayton Wagons Ltd in Lincoln, England. History Originally, D 1 was purchased for railcar type service but it was not su ...

, 1 experimental 0-4-0T locomotives

United Kingdom

Metropolitan Railway D Class The Metropolitan Railway D Class was a group of six locomotives built for the Metropolitan Railway in 1894-1895 by Sharp, Stewart and Company. Overview Two locomotives were used on the Verney Junction-Aylesbury section. The other four ran betw ...

, tank engines *

NBR D class 0-6-0T The NBR D Class ( LNER Class J83) was a class of 0-6-0 tank locomotives designed by Matthew Holmes for short distance freight, station pilot, and heavy shunting duties on the North British Railway. Service history They were introduced in 1900 a ...

, tank locomotives *

LNWR Class D The London and North Western Railway (LNWR) Class D was a class of 0-8-0 steam locomotives. They were simple engine rebuilds of earlier Webb Class A three-cylinder compound engines. History Though the original rebuilds of the Class As had reu ...

, 0-8-0 steam locomotives *

SECR D class The SECR D class is a class of 4-4-0 tender locomotives designed by Harry Wainwright for the South Eastern and Chatham Railway. Overview The construction of the initial 20 engines was shared between Ashford railway works and the Glasgow bu ...

, 4-4-0 tender locomotives

Other uses

D-class blimp The D class blimp was a patrol airship used by the US Navy in the early 1920s. The D-type blimps were slightly larger than the C-type and had many detail improvements. The Navy continued the practice of dividing the envelope production between G ...

, United States Navy blimps *

D-segment The D-segment is the 4th category of the European segments for passenger cars, and is described as "large cars". It is equivalent to the Euro NCAP "large family car" size class, and the present-day definition of the mid-size car category use ...

, a European vehicle size class * In the fictional

SCP Foundation The SCP Foundation is a fictional secret organization documented by the collaborative-writing wiki project of the same name. Within the website's shared universe, the Foundation is responsible for capturing, containing, and studying various p ...

, expendable people who are sent on dangerous missions.