| NIGMS |
National Institute of General Medical Sciences |
| NIH |
National Institutes of Health |
| NII |
National Information Infrastructure |
| NIIT |
National Institute of Information Technology |
| NIM |
Nehru Institute of Mountaineering |
| NIM |
Nuclear Instrumentation Module |
| NIM |
Normal-Incidence Monochromator or National Instrumentation Methods |
| NIMA |
National Imagery and Mapping Agency |
| NIMH |
National Institute of Mental Health |
| NIMHANS |
National Institute of Mental Health and Neuro Sciences |
| NIMO |
Neighborhood Infrastructure Management Officer |
| NIMS |
Near Infrared Mapping Spectrometer |
| NIN |
National Institute of Nutrition |
| NINDS |
National Institute of Neurological Disorders and Stroke |
| NINR |
National Institute of Nursing Research |
| NIO |
National Institute of Oceanography |
| NIO |
New Initiatives Office |
| NIOF |
Neutron Interferometry and Optics Facility |
| NIOH |
National Institute of Occupational Health |
| NIP |
National Immunisation Programme |
| NIP |
Network Interface Processor |
| NIP |
Network Input Processor |
| NIPDE |
National Initiative for Product Data Exchange |
| NIPFP |
National Institute of Public Finance and Policy |
| NIS |
Netaji Subhash Institute of Sports |
| NIS |
Network Information System |
| NIS |
Network Information Service |
| NIS |
National Irrigation System |
| NISCAIR |
National Institute of Science Communication and Information Resources |
| NISN |
NASA Integrated Services Network |
| NIST |
National Institute For Standards And Technology |
| NIST |
National Institute of Standards and Technology |
| NISTADS |
National Institute of Science, Technology and Development Studies |
| NISTAR |
NIST Advanced Radiometer |
| NIT |
Near Infrared Transmittance |
| NIUA |
National Institute of Urban Affairs |
| NJDEP |
New Jersey Department of Environmental Protection |
| NKCA |
National Kidney Cancer Association (USA) |
| NKCA |
Nickelodeon's Kid's Choice Awards |
| NKDA |
Non-Ketotic Diabetic Acidosis |
| NKHC |
Non-Ketotic Hyperglycemic Coma |
| NKHHC |
NonKetonic Hyperglycemic-Hyperosmolar Coma |
| NKT |
Natural Killer T Cells |
| NL |
No Loops |
| NL |
Next Line |
| NL |
Non Leading |
| NL |
New Line |
| NLA |
Network Location Awareness |
| NLB |
Network Load Balancing |
| NLB |
Needle Liver Biopsy |