The face of the Great Sphinx of Giza is believed to be that of Pharaoh Khafre, the fourth pharaoh of the Fourth Dynasty of the Old Kingdom of Egypt.
While there is no definitive proof, the most widely accepted theory is that the Sphinx was built during Khafre's reign, and the face is his likeness. This theory is supported by the fact that the Sphinx is located near Khafre's pyramid, and the style of the face is similar to other depictions of Khafre.
However, other theories propose that the Sphinx might depict other pharaohs, like Djedefre, Khafre's predecessor, or Thutmose IV, a pharaoh of the Eighteenth Dynasty who is known to have restored the Sphinx.
Ultimately, the true identity of the person depicted in the Sphinx's face remains a mystery. However, the prevailing theory points to Khafre as the most likely candidate.