| NACS | Nashville Academy of Computer Science 
| Others |
| NACS | National Administrative Codes Service
| Others |
| NACS | National Anti-Corruption Strategy
| Others |
| NACS | National Association Credit Services
| Others |
| NACS | National Association of Cambodian Scouts
| Others |
| NACS | National Association of Chimney Sweeps
| Others |
| NACS | National Association of College Stores
| Others |
| NACS | National Association of Consumer Shows
| Others |
| NACS | National Association of Convenience Stores
| Others |
| NACS | National Association of County Surveyors
| Others |
| NACS | National Association of Credit Specialists
| Others |
| NACS | Native American Community Services
| Others |
| NACS | Neighborhood Alliance for Child Safety
| Others |
| NACS | Netware Asynchronous Communication Services
| Others |
| NACS | Netware Asynchronous Communications Server
| Others |
| NACS | Network Academic Computing Services
| Others |
| NACS | Network and Academic Computing Services
| Others |
| NACS | Network Asynchronous Communications Services
| Others |
| NACS | Neuroscience and Cognitive Science
| Others |
| NACS | Neuroscience and Cognitive ScienceDo
| Others |
| NACS | Neuroscience and Cognitive ScienceWhat
| Others |
| NACS | Neutral Atmosphere Composition Spectrometer
| Others |
| NACS | Non Action Centered Subsystem
| Others |
| NACS | Nordic Association for China Studies
| Others |
| NACS | North Actors Club Special
| Others |
| NACS | North American Catalan Society
| Others |
| NACS | North American Catalysis Society
| Others |
| NACS | North American Challenge Skate
| Others |
| NACS | North American Community Service
| Others |
| NACS | North American Consulting School
| Others |
| NACS | North American Cycle Sport
| Others |
| NACS | Northwest Acute Care Specialists
| Others |
| NACS | Northwest Allen County Schools
| Others |
| NACS | Northwest Aquatic Club Swimming
| Others |
| NACS | Notifications and Clinical Summaries
| Others |
| NACS | Novell Asynchronous Communications Server
| Others |
| NACS | Nushi Advanced Chat Server
| Others |
| NACS | Nutrition Assessment Counseling and Support
| Others |