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The utukku were a type of spirit in Sumerian religion that had escaped the underworld, either by their own power or by being summoned forth by a priest, such as the one appearing in the Epic of Gilgamesh. They could be either benevolent or evil. The evil utukku were called Edimmu and the good lamassu or shedu.
Two of the best known edimmu were Asag (slain by Ninurta) and Alû. Though they are sometimes confused for The Seven Evil Spirits, an utukku is the raised spirit of a mortal, while The Seven were created by Anu as plague gods.
The proper Sumerian form of the name is UDUG; Utukku is the Akkadian form. It is common to change /D/ to /t/ and /G/ to /k/ in converting Sumerian into Akkadian. The final /-u/ is the Akkadian nominative case-ending.
They were siblings of the Anunnaki. They were in the service of the underworld, and were required to fetch home the fruit of the sacrifices and burnt offerings, which generally consisted of the blood, liver, and other "sweetmeats" of the sacrificed animal.
Utukku appear in Dungeons & Dragons in "Creature Catalog", Dragon #89 (September 1984). It is an outsider from Tartarus that looks like a lion-like humanoid with a quilled mane and a scaly body. They sometimes come to the Prime Material Plane to spread misery and evil and to gather treasure.
Utukku makes an appearance in the video game Final Fantasy XI as a ghost/wraith-class monster.
There are Utukku in the Bartimaeus Trilogy by Jonathan Stroud, acting as prison guards in the British Tower of London. They are portrayed as a type of djinn, and are depicted as especially dim-witted despite their strength, both of which are at odds with the typical mainstream depiction of these entities.
The American black metal band Absu has a track on their self-titled album entitled "Ye Utukku spells". The lyrics contain references to Sumerian deities and mythology, including the Utukku.