| Abbreviation | Definition |
|---|---|
| NICC | Nargis Intensive Child Care |
| NICS | Network of International Christian Schools |
| NICS | North Idaho Christian School |
| NID | National Immunization Day |
| NIE | Newspaper in Education |
| NIHS | North Iredell High School |
| NIHS | Northern Islands High School |
| NIOS | Not in Our School |
| NIPS | New Ideal Public School |
| NIS | Nagoya International School |
| NIS | Nazarbayev Intellectual Schools |
| NIS | New Interdisciplinary School |
| NIS | Northpointe Intermediate School |
| NISA | National Independent Schools Alliance |
| NISA | NATO International School of Azerbaijan |
| NISC | Northbridge International School Cambodia |
| NISD | Nacogdoches Independent School District |
| NISD | Navarro Independent School District |
| NISD | Navasota Independent School District |
| NISD | Nederland Independent School District |