A semiconductor package includes a package substrate including a base substrate including a redistribution layer, pads disposed on first and second surfaces of the base substrate and connected to the redistribution layer, and a protective layer having a mounting region in which first openings respectively exposing first pads among the pads and a second opening exposing second pads among the pads and a portion of the second surface are disposed on the second surface; a semiconductor chip disposed on the mounting region and connected to the pads through the first openings and the second opening; and a sealing material covering a portion of the semiconductor chip and extending into the second opening. Four first openings among the first openings are respectively disposed adjacent to respective corners of the mounting region. The second opening is disposed to divide the four first openings into at least two groups.