NBI may refer to:
- NBI (narrow body implant), or Mini dental implant
- Narrow-band imaging, an endoscopic method
- Nemzeti Bajnokság I
- 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)
- National Bureau of Investigation (Finland)
- National Bureau of Investigation (Philippines)
- NBI, a 1961 Filipino action film directed by Eddie Romero and starring Jose Padilla Jr.
- National Bureau of Investigation (Ukraine)
- Network Bootable Image
- Neutral Beam Injection
- Nile Basin Initiative
- Northbound interface
- National Broadband Ireland, a telecommunications company
- NBI Incorporated, an American computer company
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