Gil-galad is a fictional character in J. R. R. Tolkien's Middle-earth legendarium, the last high king of the Noldor, one of the main divisions of Elves. He is mentioned in The Lord of the Rings, where the hobbit Sam Gamgee recites a fragment of a poem about him, and The Silmarillion. In the Last Alliance of Elves and Men, Gil-galad and Elendil laid siege to the Dark Lord Sauron's fortress of Barad-dûr, and fought him hand-to-hand for the One Ring. Both Gil-galad and Elendil were killed, and Elendil's son Isildur took the Ring for himself. Gil-galad briefly appears at the opening of Peter Jackson's The Lord of the Rings film trilogy, and features in several video games based on Tolkien's Middle-earth.

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.