Au, AU, au or a.u. may refer to:
Science and technology Computing .au, the internet country code for Australia Au file format, Sun Microsystems' audio format Audio Units, a system level plug-in architecture from Apple Computer Adobe Audition, a sound editor program Windows Update or Automatic Updates, in Microsoft Windows Windows 10 Anniversary Update, of August 2016a
Physics and chemistry Gold, chemical symbol Au Absorbance unit, a reporting unit in spectroscopy Atomic units, a system of units convenient for atomic physics and other fields Ångström unit, a unit of length equal to 10−10 m or 0.1 nanometre. Astronomical unit, a unit of length used in planetary systems astronomy Arbitrary unit, a placeholder unit for when the actual value of a measurement is unknown or unimportant
Arts and entertainment Music AU (band), an experimental pop group headed by Luke Wyland Au, a 2010 release by Scottish rock band Donaldson, Moir and Paterson Au a track on Some Time in New York City by an album by John Lennon & Yoko Ono and Elephant's Memory
Magazines Alternative Ulster, a Northern Irish music magazine, now called AU A&U: America's AIDS Magazine, sponsor of the Christopher Hewitt Award
Other media Alternative universe (fan fiction), fiction by fan authors that deliberately alters facts of the canonical universe written about. Au Co, a fairy in Vietnamese mythology Age of Ultron, a 2013 series published by Marvel Comics A.U, a Chinese media franchise and brand
Organizations au (mobile phone company), a mobile phone operator in Japan AU Small Finance Bank in India African Union, a continental union Americans United for Separation of Church and State Athletic Union, the union of sports clubs in a British university Austral Líneas Aéreas (IATA code AU) Auxiliary Units, specially trained, highly secret units created by the United Kingdom government during the Second World War AGROunia, an agrarian-socialist political party in Poland
Universities Asia Ajou University in Suwon, Gyeonggi, South Korea Abasyn University in Peshawar, Khyber Pakhtunkhwa, Pakistan Andhra University in Visakhapatnam, AP, India Anhui University in Hefei, Anhui, China Aletheia University in New Taipei City, Taiwan Allahabad University in Allahabad, Uttar Pradesh, India Arellano University in Philippines Assumption University (Thailand) in Thailand Abhilashi University in Himachal Pradesh, India Adesh University in Bathinda, Punjab, India.
Europe Aarhus University in Aarhus, Denmark Aberystwyth University in Aberystwyth, Wales, United Kingdom Akademia Umiejętności in Kraków, Poland Arden University in Coventry, England
Oceania Adelaide University in South Australia Auckland University in New Zealand
North America Adelphi University in Garden City, New York Alfred University in Alfred, New York Algoma University in Sault Ste. Marie, Ontario, Canada American University in Washington, D.C. Anderson University (Indiana) in Anderson, Indiana Anderson University (South Carolina) in Anderson, South Carolina Andrews University in Berrien Springs, Michigan Antioch University in Culver City, California Apollos University in Huntington Beach, California Arcadia University in Glenside, Pennsylvania Argosy University in Alameda, California Arizona University in Tucson, Arizona Ashland University in Ashland, Ohio Athabasca University in Athabasca, Alberta, Canada Auburn University in Auburn, Alabama Augsburg University in Minneapolis, Minnesota Augusta University in Augusta, Georgia Aurora University in Aurora, Illinois
Other Air University (disambiguation), various Air Force universities
Places Aue (toponymy), a frequent element in Germanic toponymy Australia (ISO 3166 country code) Australasia Au, Guinea, Kankan Region
Austria Austria (obsolete NATO, FIPS, and LOC MARC two-letter country code) Au, Vorarlberg, Bregenz, Austria Au am Leithaberge, Austria Au im Bregenzerwald, Austria
Germany Au (Munich), Munich, Germany Au (Schwarzwald), Baden-Württemberg, Germany Au (squat), a building and cultural center in Frankfurt, Germany Au am Rhein, Germany Au in der Hallertau, Germany
Switzerland Au, St. Gallen Au, Zürich Au peninsula Schloss Au, a château in Wädenswil
Vehicles Ford Falcon (AU), a family car made in Australia Vought AU, a post-World War II US Marine Corps variant of the F4U Corsair aircraft
Other uses Au, a Welsh vodka brand owned by Sazerac Company Alopecia universalis, a medical condition involving the loss of all body hair Au (surname), a Chinese family name Au language Ab urbe condita (sometimes abbreviated as a.u.), Latin for "from the founding of the City" (Rome) Aú, a cartwheel in the Brazilian martial art of Capoeira a'u, the Hawaiian name for the Pacific blue marlin