A fan-out semiconductor package includes: an interconnection member including a first insulating layer, first and second pads respectively disposed on opposite sides of the first insulating layer, and a first via connecting the first and second pads to each other; a semiconductor chip disposed on the interconnection member; and an encapsulant encapsulating at least portions of the semiconductor chip. At least a portion of a first wall of a first trench of the first insulating layer and at least a portion of a second wall of a second trench of the second insulating layer overlap each other vertically. At least a portion of the second wall of the second trench and at least a portion of a third wall of a third trench of the third insulating layer overlap each other vertically.