In the fiction of J. R. R. Tolkien, Valandil was a king of Arnor in Middle-earth, ruling from 2 T.A. to 249 T.A.

He was the fourth son of Isildur; his elder brothers were killed by Orcs at the Gladden Fields along with their father. Valandil and his mother were in Rivendell when news of the fall of Isildur reached them.

After this disaster Valandil inherited the High Kingship over the Dúnedain. Because he was still a child when his father was killed, he had no power in Gondor where his older cousin Meneldil was left by Isildur to rule. In any case Valandil never made any attempt to reclaim the southern crown, thereby perhaps inadvertently strengthening Meneldil's claim for the throne and splitting the kingdom. The title of High King did remain with Valandil and his heirs.

For the first eight years his mother ruled in his stead, and in 10 T.A. he finally received the symbol of his kingship, the sceptre of Annúminas.

In that city he dwelt in peace until his death in 249 T.A., and was succeeded by his son Eldacar.

A much earlier Valandil was the son of Silmariën, daughter of King Tar-Elendil of Númenor. He founded the line of the Lords of Andúnië, from which the Kings of Gondor and Arnor sprung.