English abbreviations from niser to nix
- NISER (National Institute of Science Education and Research)
- NISH (Noncombatant Evacuation Operation (NEO) Intelligence Support Handbook)
- NISO (National Information Standards Organization)
- NISOD (National Instituite for Staff and Organizational Development)
- NISP (National Intelligence Support Plan)
- NISS (New Icmi Study Series)
- NIST (National Institute of Standards and Technology)
- NIT (National Invitation Tournament (U.S. college basketball))
- NITA (New Information Technologies For Automation)
- NITC (Normal Incremental Transfer Capability)
- NITE (Navigate Indy This Evening)
- NITEC (National Institute of Technical Education Certificate)
- NITES (Navy Integrated Tactical Environmental System)
- NITF (National Imagery Transmission Format)
- NITFS (National Imagery Transmission Format Standard)
- NITI (Nickel Titanium)
- NITS (Nature, Intentions, Time, Specials)
- NITSA (Northern Ireland Target Sports Association)
- NIU (Niue (ISO 3166 trigram))
- NIV (Nederlands Instituut Voor)
- NIVC (National Interactive Video Centre)
- NIW (New Information Workshop)
- NIWA (Naval Information Warfare Activity)
- NIWG (Network and Infrastructure Working Group)
- NIWS (National Institutes for Water Resources)
- NIX (Nioro Airport)