Miscellaneous
- Au Co, a fairy in Vietnamese mythology
- Ab urbe condita (sometimes abbreviated as a.u.), Latin for "from the founding of the City" (Rome)
- Alternative universe (fan fiction)
- Athletic Union, the union of sports clubs in a British university
- Au (building), a building that has been squatted in in Frankfurt, Germany
- Aú, a cartwheel in the Brazilian martial art of Capoeira
- AU (band), an experimental pop group headed by Luke Wyland
- Au (album), a 2010 release by Scottish rock band Donaldson, Moir and Paterson
- Ford AU Falcon, a family car made in Australia
- Alternative Ulster, a music magazine
- Vought AU, post-WWII US Marines variant of the F4U corsair
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