ICN
- ICN (SBB-CFF-FFS)
- ICN Graduate Business School
- ICN Radio
- Illinois Century Network
- Imperial Chinese Navy
- Incheon International Airport
- Inclusion conjunctivitis of the newborn
- Information Communications Network LLC
- Information-centric networking
- Inside Climate News
- Integrated Computing Network
- International Code of Nomenclature for algae, fungi, and plants
- International Competition Network
- International Council of Nurses
- Iodine cyanide
- Iowa Communications Network
- Itaguaí Construções Navais
- National Broadcasting Network (Trinidad and Tobago)
- Neonatal intensive care unit
- Office of the Registrar of Indigenous Corporations
- RegioSwinger
- UCL Institute of Cognitive Neuroscience
- Valeant Pharmaceuticals