Semiconductor packages and methods of forming the same are provided. One of the semiconductor packages includes a first semiconductor die, an adhesive layer, a second semiconductor die and an underfill. The first semiconductor die includes a first surface, and the first surface includes a central region and a peripheral region surrounding the central region. The adhesive layer is adhered to the peripheral region and exposes the central region. The second semiconductor die is stacked over the first surface of the first semiconductor die. The underfill is disposed between the first semiconductor die and the second semiconductor die.