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Ar-Adûnakhôr ( S. A. 2709 – 2962, r. S. A. 2899 – 2962 ) was the twentieth ruler of Númenor.

He opposed the Valar, and thus took his official name in the Adûnaic tongue instead of using the traditional Quenya form Tar-Herunúmen.

The name he choose was considered by some as blasphemous — in both languages it means " Lord of the West ", a title reserved for Manwë, Lord of the Valar.

There is some question as to whether Ar-Adûnakhôr succeeded his father, Tar-Ardamin, as King, or his grandfather, Tar-Calmacil, but the numbering of the rulers includes Tar-Ardamin in the count.

Specifically, Tar-Ardamin does not appear at all in The Lord of the Rings appendices, but he does appear in the chapter " The Line of Elros " from Unfinished Tales.

He was succeeded by his son, Ar-Zimrathôn.