The Kings of Arnor were the rulers of the realm of Arnor descended from Elendil. They were the Dúnedain of the North.

When the Exiles of Númenor were cast upon Middle-earth, Elendil founded a realm in the north called Arnor. His sons Isildur and Anárion founded the realm of Gondor in the south.

Elendil is counted as the first of the Kings of Arnor since he was the High King of both Arnor and Gondor.

Upon the death of Elendil, Isildur became the High King and so is counted as the second King of Arnor.

When Isildur and his three eldest sons died in the Disaster of the Gladden Fields, his son Valandil, who was staying with his mother in Imladris, became the third King of Arnor.

There were a total of ten Kings of Arnor and they are named here as follows:

Elendil
Isildur
Valandil of Arnor
Eldacar of Arnor
Arantar
Tarcil
Tarondor of Arnor
Valandur
Elendur
Eärendur

After the days of Eärendur, the kingdom of Arnor was divided into Arthedain, Rhudaur, and Cardolan. The line of the kings was maintained in Arthedain only, but after a time the realm of Arnor was ended until Aragorn reclaimed his rightful place as the King of both Arnor and Gondor after the War of the Ring.