Au

• .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

• 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

• 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

• Alternative Ulster, a Northern Irish music magazine, now called AU
• A&U: America's AIDS Magazine, sponsor of the Christopher Hewitt Award

• 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

• 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

• 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.

• Aarhus University in Aarhus, Denmark
• Aberystwyth University in Aberystwyth, Wales, United Kingdom
• Akademia Umiejętności in Kraków, Poland
• Arden University in Coventry, England

• Auckland University in New Zealand

• 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

• Air University (disambiguation), various Air Force universities

• Aue (toponymy), a frequent element in Germanic toponymy
• Australia (ISO 3166 country code)
• Au, Guinea, Kankan Region

• Austria (obsolete NATO, FIPS, and LOC MARC two-letter country code)
• Au, Vorarlberg, Bregenz, Austria
• Au am Leithaberge, Austria
• Au im Bregenzerwald, Austria

• 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

• Au, St. Gallen
• Au, Zürich
• Au peninsula
• Schloss Au, a château in Wädenswil

• 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

• 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

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