UO is an abbreviation for:

  • Hong Kong Express Airways, Chinese airline ( IATA code )
  • Russian Federation in accordance with the ICAO code
  • Ultima Online, an online role-playing game
  • Reverse osmosis, a method for the extraction of ion -free water
  • University of Oklahoma, the University of the State of Oklahoma
  • University of Oregon, the University of the State of Oregon
  • University of Ottawa, the University of the Canadian capital Ottawa

UO as distinguishing signs on license plate:

  • Czech Republic: Okres Ústí nad Orlicí, German: Wild Sword ( discontinued)
  • Disambiguation
  • Abbreviation