NIID
| Acronym | Definition |
|---|---|
| NIID | National Institute of Infectious Diseases (Ministry of Health and Welfare; Japan) |
| NIID | Neuronal Intranuclear Inclusion Disease (neurology) |
| NIID | National Institute for Intellectual Disability (Trinity College Dublin; Ireland) |
| NIID | Nederlandse Industriële Inschakeling Defensieopdrachten (Dutch: Netherlands Defence Manufacturers Association) |
| NIID | Normally, Identically, and Independently Distributed |
| NIID | National Information Infrastructure Development (various locations) |