An integrated fan-out package includes a first redistribution structure, a die, an encapsulant, a plurality of conductive structures, and a second redistribution structure. The first redistribution structure has a first surface and a second surface opposite to the first surface. The die is disposed over the first surface of the first redistribution structure and is electrically connected to the first redistribution structure. The encapsulant encapsulates the die. The conductive structures are disposed on the first surface of the first redistribution structure and penetrates the encapsulant. The conductive structures surround the die. The second redistribution structure is disposed on the encapsulant and is electrically connected to the first redistribution structure through the conductive structures. The second redistribution structure includes at least one conductive pattern layer that is in physical contact with the encapsulant.