| Acronym | Definition |
|---|
| NIAD➣National Institution for Academic Degrees (now National Institution for Academic Degrees and University Evaluation; Japan) |
| NIAD➣National Iguana Awareness Day |
| NIAD➣National Institute of Art & Disabilities (Richmond, CA, USA) |
| NIAD➣Nose-in-a-Day (climbing El Capitan in under 24 hours) |
| NIAD➣Norfolk Institute of Art and Design (now Norwich School of Art and Design; UK) |
| NIAD➣Net Income Adjusted for Depreciation |