Eldacar is a fictional character in J. R. R. Tolkien's universe of Middle-earth.

He ascended the throne of Arnor in T.A. 249 on the death of his father Valandil, he was the grandson of Isildur.

He should not be confused with his more famous namesake, Eldacar of Gondor.

His reign was without any event and he died in T.A. 339 and was succeeded by his son Arantar.