Valacar (1194-1432) is a fictional character in J. R. R. Tolkien's universe of Middle-earth

He was the twentieth King of Gondor and the son of Rómendacil II, whom he succeeded in 1366 T.A.

His ascension brought great unrest to Gondor, for he was sent by his father as an ambassador to Rhovanion to aquaint himself with the Northmen. On this mission he married Vidumavi, the daughter of Vidugavia, the King of Rhovanion. Because the Northmen were Middle Men, the Dúnedain in Gondor were afraid that this marriage might spoil the Númenorean blood of its Kings.

His wife died early, as was common with the Northmen, but she bore him a son, Eldacar.

When Valacar grew old, the coastal provinces rebelled. In 1432 T.A., Valacar's death turned the rebellion into a bloody civil war known as the Kin-strife. The chaos would last fifteen years until Eldacar secured the throne.

Valacar ruled Gondor for sixty-six years, and was succeeded by Eldacar in 1432 T.A.