Anime & Manga
- Code Geass contains some references to Celtic mythology, such as the Geass (derived from the geis/geas). It also heavily references Arthurian Legend, as well as Lelouch's death having shades of King in the Mountain, due to Wild Mass Guessing over his death/possible survival. It helps that The Empire refers to itself as Britannia and makes heavy use of the legends and actual history of Britain and Ireland.
- .hack features Macha and Morganna (The Morrigan) as digital goddesses. Lia Fail, the Tuatha Dé Danann's stone of destiny is one of the Root Towns of The World. Three characters are known collectively as the "Descendants of Fianna". And Crennuos is also used by CC Corp for the The World's backstory in .hack//G.U.
Comic Books
- In the Marvel Comics Thor miniseries Thor: Blood Oath, Thor and the Warriors Three are tasked with retrieving a spear called Slaughter from the Irish gods. The spear appears to be a combination of the Spear of Lugh and Gae Bolg. It's kept in a cauldron of blood to prevent it from killing anyone who happens to be nearby and is wielded by Chulain, though it doesn't have any extending barbs. Actually the whole series feels like Lighter and Softer (the giant didn't send the questers willingly into their deaths, not like Lugh) norsified Compressed Adaptation of the celtic story about the blood debt of the sons of Tuireann.
Literature
- Salvatore Doni and Duke Voban have both received Authorities from Nuada and Balor respectively in Campione!.
- Durarara!! derives significant plot points from Celtic mythology, such as Dullahan Celty.
- Diarmuid un Duibhne appears in Fate/Zero.
- Harry Potter: Wormtail's silver hand bears an interesting resemblance to Nuada's silver arm.
- The Hounds of the Morrigan overflows with references to Irish mythology, including some very obscure bits and bobs of it.
- The Inheritance Cycle: One title for Eragon is Argetlam ("silver hand" in the Ancient Language), due to the placement of the silver mark left on all Dragon Riders in the place that first touches their dragon.
Video Games
- Celtic beasts occasionally appear in Castlevania, such as Balor (or Balore, in this case) in Castlevania: Aria of Sorrow, Castlevania: Dawn of Sorrow and Castlevania: Portrait of Ruin.
- Dragalia Lost: Tartarus, the Agito of Shadow, is weak to light weapons, in this case, the Infinity +1 Sword (at this time) for light which are all named after the many weapons of the mythology. In this case we have Caladbolg (sword), Fragarach (blade), Claíomh Solais (dagger), Rog Mol (axe), Areadbhar (lance), Tathlum (bow), Brionac (wand), Del Frith (staff) and Gae Assail (manacaster).
- Fate/Grand Order includes Fionn mac Cumhaill, Diarmuid Ua Duibhne and Scáthach as Lancers, Fergus mac Roich and another Diarmuid as Sabers, Cú Chulainn in Lancers (younger and older), Caster and Berserker versions (and arcade-exclusive Setanta as a Saber), Queen Medb as a Rider and Nuada's Airgetlám actually a fake made by Merlin around Excalibur and given to Bedivere.
- The Taranis from Fuga: Melodies of Steel takes its name from the Gaulish god of thunder, likely due to how he was often associated with mobility and foul weather, along with the Roman accounts of him desiring sacrifices being reflected in the game's Soul Cannon mechanic. The second game introduces another tank known as the Belenos, named after the Gauls' god of healing.
- Link's loyal horse in The Legend of Zelda is named Epona after the Gaulish goddess of fertility and the harvest, given she was primarily a protector goddess of horses.
- Cú Chulainn and his younger form Setanta are recurring demons/Personas in the Shin Megami Tensei franchise.
- Smite features The Morrígan, Cernunnos, Cú Chulainn, Artio and Cliodhna as playable characters.
Visual Novels
- Cú Chulainn appears in Fate/stay night.
Western Animation
- The Gargoyles episode "The Hound of Ulster" features a character who is the modern reincarnation of Cú Chulainn, unknowingly in a Dating Catwoman situation with an evil banshee.note King Arthur is a minor recurring character, while Avalon and The Fair Folk also appear.
Real Life
- The regions of Jupiter's moon Europa composed of ridges and crevices are named after places in Celtic mythology, such as the Conamara Chaos
region named after the coastal area in western Ireland. Also named after Celtic mythology are many of Europa's craters, such as Pwyll (after the famous lord of Dyfed in Welsh folklore), the second-largest on the moon's surface.
