A semiconductor package including a first lower stack on a substrate and including first lower semiconductor chips, a redistribution substrate on the first lower stack, a redistribution connector electrically connecting the substrate to the redistribution substrate, a first upper stack on the redistribution substrate and including first upper semiconductor chips, a first upper connector electrically connecting the redistribution substrate to the first upper stack, a second upper stack horizontally spaced apart from the first upper stack and including second upper semiconductor chips, and a second upper connector electrically connecting the redistribution substrate to the second upper stack may be provided. The redistribution connector may be on one side of the redistribution substrate. The first upper connector may be on one side of the first upper stack. The second upper connector may be on one side of the second upper stack.