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.
UoP Racing Team is the first and longest running Greek Formula Student team located in University of Patras.
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 1 June 2016, the city had an estimated population of 36,842, and a population density of 38.9 persons per km².
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.