| Acronym | Definition |
|---|
| ACIU➣Arbejdsmarkedets Center for Internationale Uddannelsesaktiviteter (Danish: Social Center for International Training; Denmark) |
| ACIU➣Advanced Central Interface Unit |
| ACIU➣AUTODIN Conferencing Interface Unit |
| ACIU➣Abiriba Communal Improvement Union (Nigeria) |
| ACIU➣Allied Counterintelligence Unit |