A semiconductor package includes a package substrate having an upper surface and a lower surface and including a plurality of substrate pads formed on the upper surface, a capacitor structure arranged on the upper surface of the package substrate and including a semiconductor substrate and at least one decoupling capacitor formed in the upper surface of the semiconductor substrate, a plurality of first semiconductor chips mounted on the package and supported by the capacitor structure, first conductive connection members electrically connecting chip pads of the first semiconductor chips to the substrate pads, and second conductive connection members electrically connecting capacitor pads of the decoupling capacitor to the substrate pad.