D15

D15 may refer to:
 * Allis-Chalmers D15, an American tractor
 * DA-15, an electrical connector
 * Dewoitine D.15, a French fighter aircraft
 * Dublin 15, a postal district in Ireland
 * GREEK DESTROYER Vasilissa Olga, a G- and H-class destroyer of the Royal Hellenic Navy
 * HMS Vindex (D15), a Nairana-class escort carrier of the Royal Navy
 * LNER Class D15, a British steam locomotive class
 * LSWR D15 class, a British steam locomotive class
 * Pennsylvania Railroad class D15, an American steam locomotive
 * Slav Defense, a chess opening