D43

D43 may refer to:


 * D43 motorway (Czech Republic)
 * D43 road (Croatia)
 * HMS Coventry (D43), a C-class light cruiser of the Royal Navy
 * HMS Matapan (D43), a Battle-class fleet destroyer of the Royal Navy
 * HMS New Zealand (D43), a cancelled Malta-class aircraft carrier ordered for the Royal Navy
 * HMS Wessex (D43), a W-class destroyer of the Royal Navy
 * Semi-Slav Defense, a chess opening