| NCSS | National Capital Semester for Seminarians 
| Others |
| NCSS | National Center for Sports Safety
| Others |
| NCSS | National Cholera Surveillance System
| Others |
| NCSS | National Cholera Surveillance System [Haiti]
| Others |
| NCSS | National Coalition of Spaceport States
| Others |
| NCSS | National Computer Science School
| Others |
| NCSS | National Conference of State Societies
| Others |
| NCSS | National Cooperative Soil Survey
| Others |
| NCSS | National Cooperative Somatropin Surveillance
| Others |
| NCSS | National Council Of Social Service
| Others |
| NCSS | National Council Of Social Services
| Others |
| NCSS | National Crash Severity Study
| Others |
| NCSS | National Cyber Security Strategy
| Others |
| NCSS | Naval Coastal Systems Station
| Others |
| NCSS | Newton County School System
| Others |
| NCSS | Non Code Source Statement
| Others |
| NCSS | Non Commenting Source Statements
| Others |
| NCSS | North Carolina Society of Surveyors
| Others |
| NCSS | North Carolina Spine Society
| Others |
| NCSS | North Central Sight Services
| Others |
| NCSS | Northwoods Community Secondary School
| Others |
| NCSS | Number Cruncher Statistical System
| Others |