A semiconductor package includes a first package having a first semiconductor chip, a second semiconductor chip and a core member including a through-hole. At least one of the first and second semiconductor chips is disposed in the through-hole. An encapsulant is disposed in the through-hole. A first redistribution layer is disposed above the core member and is electrically connected to the first and second semiconductor chips. A second redistribution layer is disposed under the core member and electrically connects the first and second semiconductor chips with an external PCB. Core vias penetrate the core member and electrically connect the first and second redistribution layers. A second package is disposed on the first package and includes a third semiconductor chip. A plurality of first electrical connection structures electrically connects the first and second packages. A plurality of second electrical connection structures electrically connects the semiconductor package with the external PCB.