NIWL
| Acronym | Definition |
|---|---|
| NIWL | Swedish National Institute for Working Life |
| NIWL | National Institute for Work and Learning (est. 1971; Academy for Educational Development; Washington, DC) |
| NIWL | New Invaders Watch List (plants) |
| NIWL | Never in Wonderland |
| NIWL | Nevada Institute of Wellness and Longevity (medical practice) |