Integrated circuit device packages including optical elements are provided. The integrated circuit device package may include an integrated circuit device and a conductive pad on a first surface of the integrated circuit device. The conductive pad may be electrically connected to the integrated circuit device and may be configured to transmit an electrical signal. The integrated circuit device package may also include an optical element in the integrated circuit device and the optical element may be configured to transmit an optical signal through a second surface of the integrated circuit device that is opposite the first surface of the integrated circuit device.