| CISD | Canadian Industrial Security Directorate 
| Others |
| CISD | Canutillo Independent School District
| Others |
| CISD | Carroll Independent School District
| Others |
| CISD | Center for Interfaith Studies and Dialogue
| Others |
| CISD | Central Information Systems Division
| Others |
| CISD | Civilian Information Services Division
| Others |
| CISD | Colonel's Island Railroad
| Others |
| CISD | Colonel's Island Railroad Company
| Others |
| CISD | Communications Internet Systems Division
| Others |
| CISD | Computational and Information Sciences Directorate
| Others |
| CISD | Configuration Interaction Singles & Doubles
| Others |
| CISD | Conroe Independent School District
| Others |
| CISD | Coppell Independent School District
| Others |
| CISD | Correctional Institution Standardized Development
| Others |
| CISD | Council of Information Services Directors
| Others |
| CISD | Critical Incident Stress Debriefing
| Others |
| CISD | Crowley Independent School District
| Others |