NIIP
| Acronym | Definition |
|---|---|
| NIIP | Net International Investment Position (national finance) |
| NIIP | Navajo Indian Irrigation Project |
| NIIP | National Institute of Industrial Psychology |
| NIIP | Northwest Income Indicators Project (Washington State University) |
| NIIP | National Information Infrastructure Protection Act of 1996 |
| NIIP | Negative Inspiratory Intrathoracic Pressure |