Aragorn son of Arathorn is a fictional character from J. R. R. Tolkien's legendarium, one of the main protagonists of The Lord of the Rings. He is a Ranger of the North, first introduced by the name Strider, which the hobbits continue to call him. At the end of The Lord of the Rings he is crowned King Elessar Telcontar.

The son of Arathorn II and his wife Gilraen, Aragorn was born on 1 March, T.A. 2931. Through his ancestor Elendil (whom he closely resembled) Aragorn was a descendant of the first king of Númenor, Elros Tar-Minyatur; the twin brother of Elrond.

When Aragorn was only two years old, his father was killed while pursuing orcs. Aragorn was afterwards fostered in Rivendell by Elrond. At the request of his mother, his lineage was kept secret, as she feared he would be killed like his father and grandfather if his true identity as the heir of Isildur became known. Aragorn was renamed Estel ("hope" in Tolkien's invented language Sindarin) to hide his existence from Sauron and his servants. He was not told about his heritage until he came of age in 2951.