| CIAO | Career Improvement and Advancement Opportunity 
| Others |
| CIAO | Center for Invisalign and Accelerated Orthodontics
| Others |
| CIAO | Central Illinois Artist Organization
| Others |
| CIAO | Central Illinois artists organization
| Others |
| CIAO | Certified Illinois Assessing Officer
| Others |
| CIAO | Chandra Interactive Analysis Of Observations
| Others |
| CIAO | Charitable Italian American Organization
| Others |
| CIAO | Check It All Out
| Others |
| CIAO | Chief Infrastructure Assurance Officer
| Others |
| CIAO | Christian Italian Amercian Oracle
| Others |
| CIAO | Classic Italian Auto Owners
| Others |
| CIAO | Clinical Information Access Online
| Others |
| CIAO | Collaboration Interoperability Architecture and Ontology
| Others |
| CIAO | Columbia International Affairs Online
| Others |
| CIAO | Combined Italian American Organization
| Others |
| CIAO | Combined Italian Auto Organization
| Others |
| CIAO | Commitment Independence Attendance and Ownership
| Others |
| CIAO | Commitment, Independence, Attendance, and Ownership
| Others |
| CIAO | Complaints Incidents and Opportunity for improvement
| Others |
| CIAO | Component Integrated Ace Orb
| Others |
| CIAO | Component-Integrated ACE ORB
| Others |
| CIAO | Conceptual and Intermedia Arts Online
| Others |
| CIAO | Coney Island Amusement Operator
| Others |
| CIAO | Consortium Integrale Aanpak Overgewicht
| Others |
| CIAO | Council of Italian American Organizations
| Others |
| CIAO | Critical Infrastructure Assurance Office
| Others |
| CIAO | Cultural Italian American Organization
| Others |