A fan-out semiconductor package includes: a core member having a first through-hole and including a dummy metal layer; a first semiconductor chip disposed in the first through-hole and having a first active surface having first connection pads disposed thereon and a first inactive surface opposing the first active surface; a first encapsulant covering at least portions of the core member and the first semiconductor chip and filling at least portions of the first through-hole; and a first connection member disposed on the core member and the first active surface of the first semiconductor chip and including a first redistribution layer electrically connected to the first connection pads, wherein the dummy metal layer is electrically insulated from signal patterns of the first redistribution layer.