| NCIS | A National Company Incorporation Service 
| Others |
| NCIS | Namsa Customer Information System
| Others |
| NCIS | National Coalition of Independent Scholars
| Others |
| NCIS | National Contaminants Information System
| Others |
| NCIS | National Coroners Information System
| Others |
| NCIS | National Crime Investigation Squad
| Others |
| NCIS | National Criminal Intelligence Section
| Others |
| NCIS | National Criminal Intelligence Service
| Others |
| NCIS | National Criminal Investigation Squad
| Others |
| NCIS | National Criminal Investigative Services
| Others |
| NCIS | National Crop Insurance Services
| Others |
| NCIS | NATO Common Interoperability Standards
| Others |
| NCIS | Naval Crime In Sotland
| Others |
| NCIS | Naval Crime Intelligence Survey
| Others |
| NCIS | Naval Crime Investigative Services
| Others |
| NCIS | Naval Criminal Investigation Service
| Others |
| NCIS | Naval Criminal Investigative Service
| Others |
| NCIS | Naval Criminal Investigative Services
| Others |
| NCIS | Navel Criminal Investigative Service
| Others |
| NCIS | Navy Cost Information System
| Others |
| NCIS | Navy Criminal Investigation System
| Others |
| NCIS | Navy Criminal Investigative Service
| Others |
| NCIS | Ncisnational Criminal Intelligence Service
| Others |
| NCIS | Net Condition/Event Systems
| Others |
| NCIS | Nevada Career Information System
| Others |
| NCIS | New Cadre Integrated Scientists
| Others |
| NCIS | New Culture in School
| Others |
| NCIS | NHS Contract Information System
| Others |
| NCIS | Nikki Cross Investigative Show
| Others |
| NCIS | Niner Clinical Immersion School
| Others |
| NCIS | No Cancellation in Sight
| Others |
| NCIS | Norwegian Council For Information Science
| Others |
| NCIS | Nothing's Carved In Stone
| Others |