UU or uu may refer to:
Businesses
- United Utilities (LSE stock symbol UU)
 - Air Austral (IATA airline code UU)
 
Language
- "uu", an old way of spelling the letter "w" in certain Germanic languages, including Old English
 - The letter combination of uu
 
Science and technology
- UUNET, Internet Service Provider commonly referred to as 'UU'
 - Unique users, may be counted as part of web analytics in determining the popularity of a website
 - UMTS air interface or "Uu interface", which links User Equipment to the UMTS Terrestrial Radio Access Network
 - Unix-to-Unix, as in uuencode, a data transport encoding
- .uu, a compressed archive file extension, associated with uuencode
 
 
Universities
- Ulster University in Northern Ireland
 - Union University in Jackson, Tennessee, United States
 - University of Utah in Salt Lake City, Utah, United States
 - Uppsala University in Sweden
 - Utica University in Utica, New York, United States
 - Utrecht University in the Netherlands
 - Uttaranchal University in Uttarakhand, India
 
Other uses
- Union of Utrecht (Old Catholic), a federation of Old Catholic churches
 - Unitarian Universalism, a theologically liberal religion characterized by its support for a "free and responsible search for truth and meaning."
 - Unseen University, in the fictional Discworld novels of Terry Pratchett
 - UU, the production code for the 1968 Doctor Who serial The Mind Robber
 - U'u a war club from Marquesas Islands
 - Undead Unluck a shorthand for the manga by Yoshifumi Tozuka.
 
See also
- All pages with titles beginning with UU
 - All pages with titles containing UU
 - All pages with titles containing U-U
 - VV (disambiguation)
 - W (disambiguation)
 - 2U (disambiguation)
 - U2 (disambiguation)
 
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