A semiconductor package includes a lower redistribution layer disposed on a lower surface of the semiconductor chip including an insulating laver, a redistribution pattern, a via, an under bump metal (UBM), and a post disposed on the redistribution pattern. The post vertically overlaps with the UBM. A mold layer is on the lower redistribution layer and surrounds the semiconductor chip. A connecting terminal is connected to the UBM. The UBM includes a first section contacting the redistribution pattern, and a second section contacting the insulating layer. The lost has a ring shape having an inner surface and an outer surface when viewed a top view. A maximum width of the inner surface is less than a Maximum width of an upper surface of the first section. A maximum width of the outer surface is greater than the maximum width of the upper surface of the first section.