| Abbreviation | Definition |
|---|---|
| RIAC | Refugee and Immigrant Advisory Council |
| RIAC | Refugee and Immigrant Assistance Center |
| RIAC | Regional Information and Advocacy Council |
| RIAC | Regulatory Improvements Advisory Committee |
| RIAC | Rhode Island Airport Corporation |
| RIAC | Rhode Island Association of Camps |
| RIAC | Risk Identification Analysis and Control |
| RIAC | Rock Island Auction Company |
| RIAD | Remote Interface for Audio Devices |
| RIAN | Regional Innovation Acceleration Network |
| RIAO | Recherche d'Information Assistée par Ordinateur |
| RIAS | Radio in the America Sector |
| RIAS | Radio In the American Se |
| RIAS | Remote infrared audible signage |
| RIAS | Remote Installation Assistance Service |
| RIAS | Review of International American Studies |
| RIAS | Reynolds Intellectual Assessment Scales |
| RIAS | Roter interaction analysis system |
| RIAS | rotor interaction analysis system |
| RIAS | Royal Incorporation of Architects in Scotland |