A semiconductor package includes a semiconductor chip including a chip pad; a lower redistribution structure on the semiconductor chip, the lower redistribution structure including a lower redistribution insulating layer and a lower redistribution pattern electrically connected to the chip pad of the semiconductor chip; a molding layer on at least a portion of the semiconductor chip; and a conductive post in the molding layer, the conductive post having a bottom surface and a top surface, the bottom surface of the conductive post being in contact with the lower redistribution pattern of the lower redistribution structure and the top surface of the conductive post having a concave shape.