# Au

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
* 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

* 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.
* Anaheim University in Anaheim, California
* 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
* 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)
* 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

* Aú, a cartwheel in the Brazilian martial art of Capoeira
* 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)
* a'u, the Hawaiian name for the Pacific blue marlin