In the fictional universe of J. R. R. Tolkien, Ar-Pharazôn the Golden (3118 - 3319 S.A., r. 3255 - 3319 S.A.), Tar-Calion in Quenya, was the 25th and last king of Númenor.

Ar-Pharazôn was the nephew of King Tar-Palantir and husband of Tar-Palantir's daughter, Míriel. Míriel was the rightful heir to the throne of Númenor, but Ar-Pharazôn usurped her throne.

He attacked Mordor and brought Sauron back as a hostage to his kingdom, but Sauron was able to corrupt Ar-Pharazôn and convinced him to attack Valinor. Ar-Pharazôn began building a huge fleet to attack Valinor in 3310 S.A. and break the Ban of the Valar, landing in the Undying Lands in 3319 S.A. In retribution, the Valar sank Ar-Pharazôn, his fleet, and all of Númenor beneath the ocean.

Ar-Pharazôn was married to his cousin, Míriel (or Ar-Zimraphel), who was the daughter of King Tar-Palantir, whom Ar-Pharazôn succeeded when he took the throne from his wife. Their marriage was actually a violation of the Númenórean law, but because he was a powerful man none dared oppose him. His father was Gimilkhâd, Tar-Palantir's younger brother.