D77

D77 may refer to:


 * Neo-Grünfeld Defence, Encyclopaedia of Chess Openings code
 * D77 (airport), an American public airport
 * HMS Nabob (D77), a Bogue-class escort aircraft carrier
 * HMS Trafalgar (D77), a Battle-class destroyer
 * HMS Whitshed (D77), a V and W class escort destroyer