| Acronym | Definition |
|---|
| NIT | National Invitation Tournament |
| NIT | National Institute of Technology |
| NIT | Nations in Transit (survey; Freedom House; Washington, DC) |
| NIT | Notice Inviting Tender |
| NIT | Número de Identificación Tributaria (Colombian business tax number) |
| NIT | Nippon Institute of Technology (Japan) |
| NIT | Network Information Table |
| NIT | Network Investigative Technique (hacking tool; US FBI) |
| NIT | National Indigenous Times (est. 2002; Australia) |
| NIT | Network Integration Testing |
| NIT | Negative Income Tax |
| NIT | National Investment Trust (Pakistan) |
| NIT | New in Town |
| NIT | Not In Time |
| NIT | Northern Institute of Technology (Hamburg-Harburg, Germany) |
| NIT | Norfolk International Terminals |
| NIT | Network Interface Tap |
| NIT | Net Integration Technologies |
| NIT | Near Infrared Transmission |
| NIT | Not in Therapy |
| NIT | Nortel Institute for Telecommunications |
| NIT | Not Invited Tournament |
| NIT | Non Instructional Time |
| NIT | Non International Traveler |
| NIT | Near-Identity Transformation |
| NIT | Northwest Iowa Transportation, Inc. |
| NIT | Notifications for International Travel |
| NIT | National Intelligence Test |
| NIT | Network Integration Test |
| NIT | Nahzati Islomi Tojikiston (Islamic Renaissance of Tajikistan) |
| NIT | NORLUN Instability Trough (weather; named after scientists Nogueira and Lundstedt) |