Ostrea conchaphila is a species of oyster, a marine bivalve mollusk which lives on the Pacific coast of Mexico south of Baja California. Until recently there was some confusion as to whether this more southern oyster species might in fact be the same species as Ostrea lurida, the well-known but more northerly "Olympia oyster", which it resembles in shell size and color. Because of this confusion, the name O. conchaphila was sometimes applied to various populations of what is now known to be O. lurida.