D31

D31 or D.31 may refer to :

• Dewoitine D.30, a French Dewoitine aircraft
• HMAS Voyager (D31), a 1918 Royal Australian Navy W class destroyer
• HMS Arbiter (D31), a 1943 British Royal Navy escort aircraft carrier
• HMS Broadsword (D31), a 1946 British Royal Navy Weapon-class destroyer
• HMS Vigo (D31), a 1945 British Royal Navy Battle-class destroyer
• PRR D31, an American PRR 4-4-0 type steam locomotive
• D31 road (Croatia), a state road

and also:

• D31 Aragua, a Venezuelan Navy Nueva Esparta class destroyer
• the ICD-10 code for a benign neoplasm of eye and adnexa

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