| Acronym | Definition |
|---|
| NISN➣NASA Integrated Services Network |
| NISN➣Nomor Induk Siswa Nasional (Indonesian: National Student Parent Number; Department of National Education) |
| NISN➣Neuraminidase Inhibitor Susceptibility Network |
| NISN➣National Immigrant Solidarity Network (South Pasadena, CA) |
| NISN➣Nordic Irish Studies Network (University of Tromsø; Norway) |
| NISN➣National Information Sharing Network (New Jersey) |
| NISN➣National Irrigation Science Network (est. 1999) |