A semiconductor package including a semiconductor die, a molding compound and a redistribution structure is provided. The molding compound laterally wraps around the semiconductor die, wherein the molding compound includes a base material and a first filler particle and a second filler particle embedded in the base material. The first filler particle has a first recess located in a top surface of the first filler particle, and the second filler particle has at least one hollow void therein. The redistribution structure is disposed on the semiconductor die and the molding compound, wherein the redistribution structure has a polymer dielectric layer. The polymer dielectric layer includes a body portion and a first protruding portion protruding from the body portion, wherein the body portion is in contact with the base material and the top surface of the first filler particle, and the first protruding portion fits with the first recess of the first filler particle.