D class

• D-class cruiser (Germany), 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
• United States D-class submarine
• D-class ferry, roll-on/roll-off ferries operated by DFDS Seaways

• 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), diesel locomotives
• D-class Melbourne tram
• D-class Sydney tram

• DHR D Class, 0-4-0+0-4-0 Garratt-type articulated steam locomotives

• NZR D class (1874), 33 2-4-0T tank locomotives
• NZR D class (1929), 1 experimental 0-4-0T locomotives

• Metropolitan Railway D Class, tank engines
• NBR D class 0-6-0T, tank locomotives
• LNWR Class D, 0-8-0 steam locomotives
• SECR D class, 4-4-0 tender locomotives

• D-class blimp, United States Navy blimps
• D-segment, a European vehicle size class
• D-class personnel, disposable human test subjects in the fictional SCP Foundation

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• Class D (disambiguation)
• D type (disambiguation)
• {{srt}}
• Delta class (disambiguation)

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