D31

D31 may refer to:

Ships

 * ARV Aragua, a Nueva Esparta-class destroyer of the Venezuelan Navy
 * BRAZILIAN DESTROYER Piauí, a Pará-class destroyer of the Brazilian Navy
 * GREEK DESTROYER Ierax, a Cannon-class destroyer of the Hellenic Navy
 * HMAS Voyager (D31), a W-class destroyer of the Royal Australian Navy
 * HMS Arbiter (D31), a Ruler-class escort carrier of the Royal Navy
 * HMS Broadsword (D31), a Weapon-class destroyer of the Royal Navy
 * HMS Vigo (D31), a Battle-class destroyer of the Royal Navy

Other uses

 * D31 road (Croatia)
 * Dewoitine D.30, a French passenger monoplane
 * Druine D.31 Turbulent, a French ultralight aircraft
 * LNER Class D31, a class of British steam locomotives