Cemendur was a Man of Númenór.
Cemendur was the third child and son of the nobleman Axantur. He had two other siblings: Lindissë and Ardamir. He married an unnamed women and had two children named Írildë and Hallatan. His son married and had a son named Hallacar, his grandson who entered into the ruling line by marrying Tar-Ancalimë, the first Ruling Queen of Númenor.