| Acronym | Definition |
|---|
| NIA➣National Institute on Aging (US NIH; also seen as NIOA) |
| NIA➣National Investigation Agency (India) |
| NIA➣Not in Attendance (school) |
| NIA➣National Indoor Arena (UK) |
| NIA➣National Insulation Association |
| NIA➣Non-Impact Aerobics (exercise) |
| NIA➣Nevis Island Administration |
| NIA➣National Intelligence Agency (South Africa and Thailand) |
| NIA➣Neural Impulse Actuator (brain-computer interface) |
| NIA➣National Insurance Act (various locations) |
| NIA➣National Institute of Accountants |
| NIA➣Next Instruction Address |
| NIA➣Number of Inherited Attributes |
| NIA➣Neural Impulse Actuator |
| NIA➣National Irrigation Administration (Philippines) |
| NIA➣National Imaging Associates (radiology) |
| NIA➣Neuromuscular Integrative Action (mind-body-spirit fitness technique) |
| NIA➣National Institute of Aerospace |
| NIA➣Nature Improvement Area (Natural England; UK) |
| NIA➣National Insulator Association |
| NIA➣Nuclear Industry Association (UK) |
| NIA➣Nagasaki International Association (est. 1990; Japan) |
| NIA➣Net Internal Area (internal building space) |
| NIA➣Notice of Intended Action (various locations) |
| NIA➣Non-Inflammatory Acne (dermatology) |
| NIA➣Niigata International Association (Japan) |
| NIA➣No Information Available |
| NIA➣National Intelligence Application (police incident code; New Zealand) |
| NIA➣Net Income Attributable |
| NIA➣New Iraqi Army |
| NIA➣Nigerian Institute of Architects (est. 1960) |
| NIA➣Network Interface Adapter |
| NIA➣Noobs in Action (gaming) |
| NIA➣Newcastle International Airport (England; also see NCL) |
| NIA➣New Indo-Aryan (linguistics) |
| NIA➣National Infantry Association |
| NIA➣Northern and Isolation Allowance (Canadian physician incentive) |
| NIA➣Nature in Art (UK museum) |
| NIA➣Nursing Informatics Australia (Health Informatics Society of Australia) |
| NIA➣Network Infrastructure Administration |
| NIA➣Nearest International Airport |
| NIA➣Network Indicate Address |
| NIA➣Nails Industry Association |
| NIA➣Non-Instructed Advocacy |
| NIA➣Number Of Imposter Attempts (biometrics) |
| NIA➣National Information Accounts Clearinghouse |
| NIA➣Navy Industrial Association |
| NIA➣Neoplasia Intra-Epitelial Anal (Portugese) |
| NIA➣National Information Account |
| NIA➣Nerd Intelligence Agency |
| NIA➣Naval Intelligence Assessment |
| NIA➣National Information Association |