| NCDI | National Capital Diagnostic Imaging 
| Others |
| NCDI | National Community Development Initiative
| Others |
| NCDI | National Community Development Institute
| Others |
| NCDI | National Cyber Defense Initiative
| Others |
| NCDI | Native Community Development Institute
| Others |
| NCDI | New Concepts Development International
| Others |
| NCDI | North Carolina Dance Institute
| Others |
| NCDI | North Carolina Destination Imagination
| Others |
| NCDI | Northern California Debate Institute
| Others |
| NCDI | Northern Centre for Digital Imaging
| Others |
| NCDI | nosocomial Clostridium difficile infection
| Others |