Ukush, also sometimes Uu or Bubu (Sumerian: , which can be read u<sub>2</sub>-<sub>3</sub> or u<sub>2</sub>-u<sub>2</sub>; died 2358 BC) was a Sumerian ruler (ensi) of the city-state of Umma. He was the father of Lugal-zage-si who took control over all of Sumer.
Ukush is known from the ' of Lugal-Zage-Si:
Other inscriptions, such as an inscription on a brick with a central hole in the Bible Lands Museum, also mention Lugalzagesi as "son of Ukush" (ð ðÂÂÂðÂÂÂ, dumu u<sub>2</sub>-u<sub>2</sub>). Another dedicatory inscription is also known.
It is thought that he played an important role in making Umma a strong city with a powerful army, which allowed his son to achieve the defeat of neighbouring and traditional rival Lagash and its king Urukagina, and then the conquest of all Sumer.