| Acronym | Meaning |
 | NHL | Non-Hodgkin Lymphoma |
| NHLBI | National Heart |
| NHMRC | National Health And Medical Research Council (Australia) |
| NHO | Natural Hybrid Orbital |
| NHOMO | Next Highest Occupied Molecular Orbital |
| NHRL | Northern Hemisphere Reference Line |
| NIA | National Institute On Aging |
| NIAID | National Institute Of Allergy And Infectious Diseases |
| NIBSC | National Institute For Biological Standards And Control |
| NICA | Nonideal Competitive Adsorption |
| NICE | Neutral Interstellar Composition Experiment |
| NICE-OHMS | Noise-immune Cavity-enhanced Optical Heterodyne Molecular Spectroscopy |
| NICI | Negative Ion Chemical Ionization (mass Spectrometry) |
| NICISS | Neutral Impact Collision Ion Scattering Spectroscopy |
| NICMOS | Near-IR Camera And Multiobject Spectrometer |
| NICNAS | National Industrial Chemicals Notification And Assessment Scheme (Australia) |
| NICS | Nucleus-independent Chemical Shifts |
| NIDDM | Non-insulin-dependent Diabetes Mellitus |
| NIEHS | National Institute Of Environmental Health Science |
| NIEL | Non-ionizing Energy Loss |
| NIEM | Noniterative Integral Equation Method |
| NIES | National Institute For Environmental Studies (Japan) |
| NIESST | Nuclear Decay-induced Excited-spin-state Trapping |
| NIF | National Ignition Facility |
| NIGA | Neutron Induced Gamma Activity |
| NIGET | Neutron-induced Gamma-ray Emission Tomography |
| NIGMS | National Institute Of General Medical Sciences (NIH) |
| NIH | National Institutes Of Health |
| NIHHS | Notification Of Installations Handling Hazardous Substances Regulations (UK) |
| NIHL | Noise-Induced Hearing Loss |
| NIMBY | Not In My Backyard |
| NIMR | National Institute For Medical Research |
| NIMS | Near-IR Mapping Spectrometer |
| NIMS | Negative Ion Mass Spectrometry |
| NIOSH | National Institute For Occupational Safety And Health |
| NIPALS | Nonlinear Iterative Partial Least Squares |
| NIPDWR | National Interim Primary Drinking Water Regulations |
| NIPR | National Institute Of Polar Research |
| NIR | Near Infrared |
| NIRA | Near Infrared Reflection Analysis |
| NIRDIA | Near Infrared Dye Immunoassay |
| NIRE | National Institute For Resources And Environment |
| NIRF | Near-infrared Fluorescence |
| NIRIM | National Institute For Research In Inorganic Materials |
| NIRIM | National Institute For Research In Inorganic Materials |
| NIRIM | Near-IR Raman Imaging Microscope |
| NIRIS | Near-infrared Imaging Spectroscopy |
| NIRMS | Noble Gas-ion Reflection Mass Spectrometry |
| NIRS | National Inorganics And Radionuclides Survey |
| NIRS | Neutral Impact Radiation Spectroscopy |
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