| Acronym | Definition |
|---|
| NCIS | Naval Criminal Investigative Service |
| NCIS | Nothing's Carved in Stone (band) |
| NCIS | National Coroners Information System (Australia) |
| NCIS | National Crime Intelligence Service |
| NCIS | Nebraska Career Information System |
| NCIS | National Coalition of Independent Scholars |
| NCIS | Network Communications and Information Systems (various organizations) |
| NCIS | No Criminal Is Safe (clothing line) |
| NCIS | New Century Infusion Solutions (Brea, CA) |
| NCIS | National Centre for Indigenous Studies (Australian National University; Australia) |
| NCIS | National Crime Investigation Squad |
| NCIS | National Crop Insurance Service (gathers crop-hail statistics) |
| NCIS | Nuclear Criticality Information System |
| NCIS | NATO Common Interoperability Standards |
| NCIS | Navy Cost Information System |
| NCIS | Naval Criminal Intelligence Command |
| NCIS | NATO Common Interface Standard |
| NCIS | No Change in Status |
| NCIS | National Coordinated Industry Survey (Australia) |