| Abbreviation | Definition |
|---|---|
| NCII | National Counselling Institute of Ireland |
| NCIM | Nairobi County Institute of Management |
| NCIT | National Capital Institute of Telecommunications |
| NCIV | Nederlands Christelijk Instituut voor Volkshuisvesting (Dutch: Dutch Christian Institute for Housing; Netherlands) |
| NCLI | National Church Leadership Institute |
| NCLI | National Conservation Leadership Institute |
| NCRI | National Cancer Research Institute |
| NCRI | National Coral Reef Institute |
| NCRI | National Council of Rural Institutes |
| NCRI | Neurological Clinical Research Institute |
| NCRI | Northwest Cultural Resources Institute |
| NDBI | National Deaf Business Institute |
| NDCI | National Drug Court Institute |
| NDI | National Defense Institution |
| NDI | National Directors Institute |
| NDI | National Disability Institute |
| NDI | National Disability Institute's |
| NDI | Nebraska Debate Institute |
| NDIM | New Delhi Institute of Management |
| NDIRS | North Dakota Institute for Regional Studies |