The chemical symbol of Gold (Au)

Auburn University, Auburn, Alabama, United States

American University, Washington, DC, United States

African Union

Allahabad University, Allahabad, Uttar Pradesh, India

Athabasca University, Athabasca, Alberta, Canada

Astronomical unit (AU, au, a.u., or ua), a unit of length approximately equal to the distance between the Earth and the Sun

Alfred University, Alfred, New York, United States

Adelaide United FC, an Australian professional football (soccer) club

Anderson University (Indiana), Anderson, Indiana, United States

Alternative universe (fan fiction), a fan fiction term

Andrews University, Michigan, United States

.au Internet country code top-level domain for Australia

Ford AU Falcon, a car that was sold in Australia and New Zealand from 1998 to 2002

Anderson University (South Carolina), Anderson, South Carolina, United States

Aarhus University, Aarhus, Denmark

Americans United for Separation of Church and State

Alternative Ulster, music magazine based in Belfast, Northern Ireland

Atomic units (au), a system of measurement units based on fundamental atomic properties

Au im Bregenzerwald

au file format, Sun Microsystems' audio format

au (mobile phone operator), in Japan

Audio Units plug-in programming interface from Apple Computer

Avengers United, a UK comic commonly referred to as AU

Au (surname) (區 or 歐) is a common family name in Hong Kong

Absorbance Units (AU), in spectroscopy, a logarithmic scale of relative absorption of a given wavelength of light

Austral Lineas Aereas, airline (IATA airline code AU)

Annals of Ulster, in Irish historical writings

Athletic Union, the union of sports clubs in a British university

Au-Breisgau

Au in der Hallertau

Au am Leithaberge

Au, St. Gallen

Akademia Umiejętności (Academy of Learning), Polish science institution

Adventure Unlimited

Au (squat), a well-known squatted building in Frankfurt, Germany

Aberystwyth University (former member of the University of Wales), Aberystwyth, United Kingdom

Australia (WMO and ISO country code digram); see ISO 3166-2:AU for subdivisions

Austria (FIPS 10-4 and obsolete NATO country code digram)

Au, Vorarlberg, a town in the district of Bregenz in Vorarlberg in Austria

Au (Munich), a district in Munich, Germany and part of the Au-Haidhausen borough of the city.

Au, Guinea, a town in the Kankan Region of Guinea

Au, predecessors of the Vietnamese people

Au or Aue is an old Germanic word for stream, larger rivulet, or smaller river, a cognate of several rivers Aa and with Å in Swedish. Therefore, Au or Aue (earlier Old High German ouw(i)a or MHG ouwe, owe) are used in connection with the names of many towns and places. Related are territories, named Gau or Gaue. Samples: