A semiconductor package includes a package substrate. An interposer is disposed on the package substrate. The interposer in a semiconductor substrate, a wiring layer disposed on an upper surface of the semiconductor substrate and having a plurality of wirings therein, redistribution wiring pads disposed on the wiring layer and electrically connected to the wirings, bonding pads disposed on the redistribution wiring pads, and an insulation layer pattern disposed on the wiring layer and exposing at least a portion of the bonding pad, and first and second semiconductor devices disposed on the interposer. The first and second semiconductor devices are spaced apart from each other and are electrically connected to each other by at least one of the wirings.