Au, AU or au may refer to:
Australia ( ( listen)), officially the Commonwealth of Australia, is a sovereign country comprising the mainland of the Australian continent, the island of Tasmania and numerous smaller islands.
Austria ( ( listen); German: Österreich [ˈøːstɐˌraɪç] ( listen)), officially the Republic of Austria (German: Republik Österreich, listen ), is a federal republic and a landlocked country of over 8.8 million people in Central Europe.
Augustus (Latin: Imperator Caesar Divi filius Augustus; 23 September 63 BC – 19 August 14 AD) was a Roman statesman and military leader who served as the first Emperor of the Roman Empire, controlling Imperial Rome from 27 BC until his death in AD 14. His status as the founder of the Roman Principate has consolidated an enduring legacy as one of the most effective and controversial leaders in human history.
Austin ( ( listen)) is the capital of the U.S. state of Texas and the seat of Travis County, with portions extending into Hays and Williamson counties.