UO may stand for:
Computer and Information Science (CIS) at the University of Oregon is a leading computer science department established in 1970. It has been consistently ranked among the top 100 computer science programs over the decades.
Uozu (魚津市, Uozu-shi) is a city in the eastern part of Toyama Prefecture, Japan. As of 1 March 2018, the city had an estimated population of 42,224 in 16,811 households and a population density of 210 persons per km².
Uonuma (魚沼市, Uonuma-shi) is a city located in Niigata Prefecture, Japan. As of September 2018, the city had an estimated population of 36,470 in 13,289 households , and a population density of 38.9 persons per km².
UoP Racing Team is the first and longest running Greek Formula Student team located in University of Patras.
Honeywell UOP, formerly known as UOP LLC or Universal Oil Products, is a multi-national company developing and delivering technology to the petroleum refining, gas processing, petrochemical production, and major manufacturing industries.
UoSAT-2, which is also known as UO-11 and OSCAR-11, is a British satellite orbiting in Low Earth Orbit.