AU
- Au – (s) Gold (Latin Aurum)
- AU – (i) African Union (was OAU before 2000) – American University – (s) Astronomical Unit – Australia (ISO 3166 digram) – Austria (FIPS 10-4 country code)
- AUC – (i) Ab Urbe Condita / Anno Urbis Conditae (Latin "from the founding of the city" / "in the year since the founding of the city") (of Rome) – Area Under the Curve (concentration time curve; medicine)
- AUD – (s) Australian dollar (ISO 4217 currency code)
- AUS – (s) Australia (ISO 3166 trigram)
- AUSCANNZUKUS – (p) Australia, Canada, New Zealand, United Kingdom, United States (security designation)
- Auslan – (p) Australian Sign Language
- AUT – (s) Austria (ISO 3166 trigram)
- AUTL – (i) Army Universal Task List
Read more about this topic: List Of Acronyms And Initialisms: A