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.
Uonuma (魚沼市, Uonuma-shi) is a city located in south-central Niigata Prefecture, in the Hokuriku region of Japan.
Uozu (魚津市, Uozu-shi) is a city in the eastern part of Toyama Prefecture, Japan. As of 1 October 2016, the city had an estimated population of 42,556 and a population density of 212 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.
UOLDIVEO is an UOL group Universo Online owned firm that offers solutions in IT Outsourcing. The firm has a staff of 1,300 employees and operates throughout Brazil.