ACIU
| 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 |