| CISI | California Institute for School Improvement 
| Others |
| CISI | Chartered Institute for Securities & Investment
| Others |
| CISI | Chartered Institute for Securities and Investments
| Others |
| CISI | Chartered Institute for Securities Investment
| Others |
| CISI | Chartered Institute of Securities and Investment
| Others |
| CISI | Cultural Identity Studies Institute
| Others |
| CISI | Cultural Insurance Services International
| Others |