| OSSI | Office of School Support and Improvement 
| Others |
| OSSI | Office of Security and Strategic Information
| Others |
| OSSI | Office of Security Strategic Information
| Others |
| OSSI | Office of Student Success Innovations
| Others |
| OSSI | Office of System and School Improvement
| Others |
| OSSI | Oklahoma School Security Institute
| Others |
| OSSI | One Stop Shopping Initiative
| Others |
| OSSI | Open Source Satellite Initiative
| Others |
| OSSI | Open Source Seed Initiative
| Others |
| OSSI | Open Source Software Institute
| Others |
| OSSI | Operating Systems Support and Integration
| Others |
| OSSI | Operation Support Systems Interface
| Others |
| OSSI | Operational Service Status Indicator
| Others |
| OSSI | Operations Support System Interface
| Others |
| OSSI | Oracle Secure Search Initiative
| Others |
| OSSI | Oracle Standard System Installation
| Others |
| OSSI | Organizational Science Summer Institute
| Others |