| Acronym | Definition |
|---|
| NTI | Narrow Therapeutic Index |
| NTI | NASCAR (National Association for Stock Car Auto Racing) Technical Institute |
| NTI | Nuclear Threat Initiative |
| NTI | Network Technologies, Inc. (Aurora, Ohio) |
| NTI | National Transit Institute (New Brunswick, New Jersey) |
| NTI | NewTech Infosystems (software company, Irvine, California) |
| NTI | Nunavut Tunngavik Incorporated |
| NTI | New-to-Industry |
| NTI | Nanotechnology Institute (Philadelphia, PA) |
| NTI | New Technologies Inc. (Gresham, Oregon) |
| NTI | Niveau Technique d'Intervention (French: Technical Level of Intervention) |
| NTI | Newtech Infosystems |
| NTI | National Technical Information |
| NTI | NY Thermal, Inc. (home heating; Canada) |
| NTI | Non-Thyroidal Illness |
| NTI | Not Turned In |
| NTI | National Technology Initiative |
| NTI | Nociceptive Trigeminal Inhibition (medical/dental) |
| NTI | New Technology Institute |
| NTI | Nielsen Television Index |
| NTI | National Tourism Indicators (statistics used to project tourism demand) |
| NTI | New Technology Insertion |
| NTI | Northern Trust Investments (Chicago, IL) |
| NTI | Non-Taxable Income |
| NTI | NeighborWorks Training Institute (Washington, DC) |
| NTI | New Tech Infosystems |
| NTI | National Toxics Inventory |
| NTI | Neutral Tandem, Inc. (telecommunications; Chicago, IL) |
| NTI | National Trauma Institute (San Antonio, TX) |
| NTI | Non-Terrestrial Intelligence |
| NTI | New Technology Integration |
| NTI | Net Technologies, Inc. |
| NTI | National Television Index |
| NTI | Near Term Improvement |
| NTI | No Travel Involved |
| NTI | National Tactical Integration |
| NTI | Not-To-Interfere |
| NTI | Nippon Telematique, Inc. (various locations) |
| NTI | Neurodiagnostic Technology Institute (Orlando, FL) |
| NTI | NTI-Neutrik Test Instruments (Oregon) |
| NTI | National Training Initiative (est. 2000) |
| NTI | Network Terminating Interface (hardware) |
| NTI | Nippon Technology Industries (Japan) |
| NTI | Non Tobacco Ingredients |
| NTI | Neighbourhood TAVIS (Toronto Anti-Violence Intervention Strategy) Initiative (Canada) |
| NTI | Northern Telecom, Incorporated |
| NTI | Naval Travel Instructions (US Navy) |
| NTI | National Temperature Index |
| NTI | National Training Inc. (Orange Park, FL) |
| NTI | National Technology Index (Canada) |
| NTI | Network Termination Interface |
| NTI | Near Term Initiative |
| NTI | No Text Included |
| NTI | Never Think Impossible |