Au, AU or au may refer to:
Australia, 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 [ˈøːstɐraɪç] (listen)), officially the Republic of Austria (German: Republik Österreich, listen ), is a country of nearly 9 million people in Central Europe.
Augustus (Latin: Imperator Caesar Divi filius Augustus; 23 September 63 BC – 19 August AD 14) was a Roman statesman and military leader who was 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.He was born Gaius Octavius Thurinus into an old and wealthy equestrian branch of the plebeian gens Octavia.
Austin is the capital of the U.S. state of Texas and the seat of Travis County, with portions extending into Hays and Williamson counties.