In German heroic legend, Alberich is a dwarf. He features most prominently in the poems Nibelungenlied and Ortnit. He also features in the Old Norse collection of German legends called the Thidreksaga under the name Alfrikr. His name means "ruler of supernatural beings (elves)", and is equivalent to Old French Auberon (English Oberon).
The name was later used for a character in Richard Wagner's opera cycle Der Ring des Nibelungen.
Alberich plays a prominent role in the Nibelungenlied, where he is the guardian of the Nibelung's treasture and has the strength of twelve men. Siegfried overpowers him using his cloak of invisibility (Tarnkappe), after which the dwarf serves the hero. Siegfried later pulls his beard in mock combat when he arrives unannounced to claim the treasure.
In the poem Ortnit, Alberich, here described as having the form of a small child and visible only to the possessor of a magical ring, seduces the queen of Lombardy and sires the hero Ortnit. When Ortnit later seeks to woo the daughter of the heathen king Machorel, Alberich reveals his paternity to Ortnit and aids him in his quest, playing tricks on the heathen king and even impersonating the heathen god Mahmet. When Ortnit sets out on his final fatal adventure against a plague of dragons, Alberich takes back the magic ring and warns Ortnit not to go on his quest.
In the Thidrekssaga, Alfrikr makes the swords Eckisax and Nagelringr, giving this last sword to Thidrek.
References to Alberich outside of heroic poetry are rare.
In Wagner's opera cycle Der Ring des Nibelungen, Alberich is the chief of the Nibelungen race of dwarfs and the main antagonist driving events. He gains the power to forge the ring after renouncing love. His brother, the smith Mime, creates the Tarnhelm for Alberich. In Richard Wagner's opera, news of the gold robbery and ring of power incited gods and giants alike to action. The giants Fafner and Fasolt demanded the ring in payment for building Valhalla, and carried off Freyja as a hostage. In the border, the gods, Odin, Frigg, Loki, Freyr, and Thor all search despairingly for the hidden treasure. Hagen, the murderer of the hero [Siegfried], is the son of Alberich by Grimhilde, a human woman.