Disclosed herein is a three-dimensional (3D) semiconductor package. The 3D semiconductor package includes a printed circuit board, a main interposer that is formed on the printed circuit board, a semiconductor device that is formed on the main interposer, and a support interposer that is disposed on the same plane as a plane of the semiconductor device, or disposed between the main interposer and the semiconductor device. Here, each of the main interposer, the semiconductor device, and the support interposer may include a through-via formed based on a thickness direction of the printed circuit board.