{{Wiktionarypar2|Au|au}}
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'''Au''' or '''AU''' may refer to:

== In science ==
* [[Absorbance Units]] (AU), in spectroscopy, a logarithmic scale of relative absorption of a given wavelength of light
* [[Astronomical unit]] ('''AU''', '''au''', '''a.u.''', or '''ua'''), a unit of length approximately equal to the distance between the Earth and the Sun
* [[Atomic units]] ('''au'''), a system of measurement units based on fundamental atomic properties
* The chemical symbol of [[Gold]] ('''Au''')

== In computing ==
* [[.au]] Internet country code top-level domain for Australia
* [[au file format]], Sun Microsystems' audio format
* [[Audio Units]] plug-in programming interface from Apple Computer

==Universities==
* [[Aarhus University]], Aarhus, Denmark
*[[Aberystwyth University]] (former member of the [[University of Wales]]), Aberystwyth, United Kingdom
* [[Alfred University]], Alfred, New York, United States
* [[Allahabad University]], Allahabad, Uttar Pradesh, India
* [[American University]], Washington, DC, United States
* [[Andrews University]], Michigan, United States
* [[Anderson University (Indiana)]], Anderson, Indiana, United States
* [[Anderson University (South Carolina)]], Anderson, South Carolina, United States
* [[Athabasca University]], Athabasca, Alberta, Canada
* [[Auburn University]], Auburn, Alabama, United States

== Places ==
* [[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 (district)|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]]

== Organizations ==
* [[Adventure Unlimited]]
* [[African Union]]
* [[Academy of Learning|Akademia Umiejętności]] (Academy of Learning), Polish science institution
* [[Alternative Ulster]], music magazine based in Belfast, Northern Ireland
* [[Americans United for Separation of Church and State]]
* [[au (mobile phone operator)]], in Japan
* [[Austral Lineas Aereas]], airline (IATA airline code AU)

== Miscellaneous ==
* Au, the Norwegian form of ouch.
* [[Adelaide United FC]], an Australian professional football (soccer) club
* [[Au (squat)]], a well-known squatted building in Frankfurt, Germany
* [[Aú]] is a cartwheel in the Brazilian martial art of Capoeira
* [[Alternative universe (fan fiction)]], a fan fiction term
* [[Annals of Ulster]], in Irish historical writings
* [[Athletic Union]], the union of sports clubs in a British university
* [[Au (surname)]] (區 or 歐) is a common family name in Hong Kong
* [[Au Co|Au]], predecessors of the [[Vietnamese people]]
* [[Ford AU Falcon]], a car that was sold in Australia and New Zealand from 1998 to 2002
* [[Avengers United]], a UK comic commonly referred to as AU

== Au or Aue- earlier Ouwe in geography==
''Au'' or ''Aue'' is an old Germanic word for stream, larger rivulet, or smaller river, a cognate of [[Aa River|several rivers ''Aa'']] and with [[Å#Nordic languages|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:

;Germany:
* [[Au in der Hallertau]]
* [[Au (Schwarzwald)|Au-Breisgau]]

;Switzerland:
* [[Au, Schaffhausen]]
* [[Au, Thurgau]]
* [[Au, Zürich]]
* [[Au, St. Gallen]]

;Austria:
* [[Au am Anzbach]]
* [[Au am Kraking]]
* [[Au am Leithaberge]]
* [[Au an der Donau]]
* [[Au an der Traun]]
* [[Au bei Brandstatt]]
* [[Au bei der Traun]]
* [[Au bei Ed]]
* [[Au bei Hischmannsberg]]
* [[Au bei hohen Steg]]
* [[Au bei Natternbach]]
* [[Au bei Sirfling]]
* [[Au bei Turnau]]
* [[Au im Bregenzerwald]]

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