English abbreviations from ninnm to nisda
- NINNM (National Institute of Neurology and Neurosurgery of Mexico)
- NIO (Nicaraguayan cordoba oro (ISO 4217 currency code))
- NIOC (Navy Information Operations Command)
- NIP (New Independence Party / National Independence Party)
- NIPA (NGOs (Non-Governmental organization) for Integrated Protected Areas)
- NIPD (National Institute for People with Disabilities)
- NIPER (National Institute of Pharmaceutical Education and Research)
- NIPM (National Institute of Personnel Management)
- NIPP (National Infrastructure Protection Plan)
- NIPR (Non-secure Internet Protocol (IP) Router Network)
- NIPRNET (Non-Secure Internet Protocol Router Network)
- NIPS (Naval Intelligence Processing System)
- NIQ (Niaqornat Heliport)
- NIR (Northern Ireland (FIFA trigram; not eligible for an ISO 3166 or IOC trigram))
- NIRA (National Import Racing Association)
- NIRSA (National Intramural-Recreational Sports Association)
- NIRT (Nuclear Incident Response Team)
- NIS (Simberi Airport)
- NISAC (U.S. National Infrastructure Simulation and Analysis Center)
- NISCAP (NSA Information System Certification and Accreditation Program)
- NISCC (Northern Ireland Social Care Council)
- NISDA (Nantucket Island School of Design and the Arts)