D34

D34, D-34 or D.34 may refer to :

• HMS Diamond (D34), a 2007 British Royal Navy D Class of air defence destroyer
• HMS Velox (D34), a 1917 British Royal Navy V class destroyer
• LNER Class D34, a 1913 British class of 4-4-0 steam locomotive
• Brazilian destroyer Mato Grosso (D34), a United States Navy destroyer transferred to the Brazilian Navy in 1972
• PRR D34, an American PRR 4-4-0 steam locomotive model
• D34 road (Croatia), a state road

and also:

• the ICD-10 code for a benign neoplasm of thyroid gland
• the Tarrasch Defense chess code

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