In the works of J. R. R. Tolkien, the Noldor are a kindred of Elves who migrate west to the blessed realm of Valinor from the continent of Middle-earth, splitting from other groups of Elves as they went. They then settle in the coastal region of Eldamar. The Dark Lord Morgoth murders their first leader, Finwë. The majority of the Noldor, led by Finwë's eldest son Fëanor, then return to Beleriand in the northwest of Middle-earth. This makes them the only group to return and then play a major role in Middle-earth's history; much of The Silmarillion is about their actions. They are the second clan of the Elves in both order and size, the other clans being the Vanyar and the Teleri.

In J. R. R. Tolkien's writings, Elves are the first fictional race to appear in Middle-earth. Unlike Men and Dwarves, Elves are immortal, though they can be killed in battle. If so, their souls go to the Halls of Mandos in Aman. After a long life in Middle-earth, Elves yearn for the Earthly Paradise of Valinor, and can sail there from the Grey Havens. They feature in The Hobbit and The Lord of the Rings. Their history is described in detail in The Silmarillion.