- AEIOU stands for Any Easy Intimacy (book)
- AEIOU stands for Alles Erdreich Ist Österreich Untertan (Austria Is to Govern the World)
- AEIOU stands for Austriae Est Imperare Orbi Universo (of Austria is to Govern all the World)
- AEIOU stands for Autism Early Intervention Outcomes Unit
- AEIOU stands for Austria Erit in Orbe Ultima (Austria Will Exist for Ever)
- AEIOU stands for Annotierbares Elektronisches Interaktives Oesterreichisches Universal-Informationssystem (German: Annotatable Electronic Interctiv Universal Information System; Austrian Federal Ministry for Education, Science and Culture )
- AEIOU stands for Alliance Ecological Interplanetary Observation Union
- AEIOU stands for Address Extension by IP Option Usage
- AEIOU stands for Achieving Excellence in Our University
- AEIOU stands for Applied Epi Info for Occupational Use
- AEIOU stands for Alternative Exhibition Information of the Universe
- AEIOU stands for Absolute/Axiomatic, Emotional/Ego/Experienced, Improvable truths, Observed, Unique truth (logic framework)
- AEIOU stands for An Elephant in Orange Underwear (vowel mnemonic)
- AEIOU stands for Annotable Elektronic Interactive Oesterreich Universal Information System
- AEIOU stands for Associação de Enxadristas Intergalácticos Onicolores e Unívocos (Portugese)
- AEIOU stands for Achieving Excellence In Our Uniqueness (retirees)
AEIOU