| 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) |