| Acronym | Definition |
|---|
| CAU | Conselho de Arquitetura E Urbanismo (Portuguese: Architecture and Urban Planning Council; Brazil) |
| CAU | Consumer Affairs Unit (various locations) |
| CAU | Clark Atlanta University |
| CAU | Caucasian |
| CAU | Christian-Albrechts-Universität (Christian Albrechts University; Kiel, Germany) |
| CAU | Centro de Atención A Usuarios |
| CAU | Cluster Aware Updating |
| CAU | China Agricultural University |
| CAU | Chang'an University (China) |
| CAU | Cisco Aironet Uninstall |
| CAU | Control Access Unit |
| CAU | Carlos Albizu University (Miami, Florida) |
| CAU | Commission of the African Union (Ethiopia) |
| CAU | Cold Air Unit |
| CAU | California Aeronautical University (Bakersfield, CA) |
| CAU | Community Association Underwriters of America, Inc. (Newtown, PA) |
| CAU | Cruel and Unusual |
| CAU | Controlled Access Unit |
| CAU | Child Abuse Unit (police incident code; New Zealand) |
| CAU | Confederación Americana de Urología |
| CAU | Customer Assistance Unit (various locations) |
| CAU | Command Arithmetic Unit |
| CAU | Carbon Adsorption Unit |
| CAU | Cable Access Unit |
| CAU | Covert Assault Unit (Counter Strike clan) |
| CAU | Cybertron Alliance Universe |
| CAU | Cell Adapter Unit |
| CAU | Command Acquisition Unit (NASA) |
| CAU | Client Assessment Unit (establishing disability) |
| CAU | Command Activation Unit (NASA) |
| CAU | Crew Access Unit (intercom equipment) |
| CAU | Customer Acquisition Unit (NASA) |
| CAU | Caribbean African Unity (New York) |
| CAU | Central Arbitration Unit |
| CAU | Crypto-Auxiliary Unit |
| CAU | Communications Access Unit |
| CAU | Community Advice Unit |
| CAU | Cryptographic Ancillary/Authorization Unit |
| CAU | Confédération d'Alliances Unies (French: Confederation of United Alliances; online gaming clan) |