NBI may refer to:
- NBI (narrow body implant), or Mini dental implant
- Nicolas Berggruen Institute
- Niels Bohr Institute
- NBI (bank), a state-run Icelandic bank
- Nation Brands Index
- Nathaniel Branden Institute
- National Bridge Inventory
- National Bureau of Investigation (disambiguation)
- Keskusrikospoliisi, National Bureau of Investigation of Finland
- National Bureau of Investigation (Philippines)
- National Bureau of Investigation (Ukraine)
- Network Bootable Image
- Neutral Beam Injection
- Nile Basin Initiative
- Northbound interface