NBI
- Berggruen Institute
- Dental implant
- NBI (bank)
- NBI Incorporated
- Narrow-band imaging
- Nathaniel Branden Institute
- Nation Brands Index
- National Bridge Inventory
- National Bureau of Investigation (Finland)
- National Bureau of Investigation (Philippines)
- National Bureau of Investigation (Ukraine)
- National Bureau of Investigation (disambiguation)
- Nemzeti Bajnokság I
- Network Bootable Image
- Neutral Beam Injection
- Niels Bohr Institute
- Nile Basin Initiative
- Northbound interface
- Opera Nazionale Balilla