| Acronym | Definition |
|---|
| ISN | International Relations and Security Network |
| ISN | International Society of Nephrology |
| ISN | Intelligent Systems and Networks |
| ISN | Information Systems and Networks (various organizations) |
| ISN | Initial Sequence Number (TCP) |
| ISN | InfoSec News |
| ISN | Internment Serial Number |
| ISN | International Scleroderma Network |
| ISN | International School of Nice (France) |
| ISN | Information Services |
| ISN | Initial Sequence Number |
| ISN | Internet School Network |
| ISN | Internet Shopping Network |
| ISN | Internet Society News |
| ISN | Information Systems and Networks |
| ISN | Interactive Support Network |
| ISN | Interface Serving Node |
| ISN | Input Sequence Number |
| ISN | Inspection Support Network (software) |
| ISN | Indian Sports News (website) |
| ISN | Institute for Soldier Nanotechnologies (US Army and MIT) |
| ISN | International Student Night (various locations) |
| ISN | Bureau of International Security and Nonproliferation |
| ISN | Institute for Science Networking Oldenburg (Germany) |
| ISN | Internet Service Node |
| ISN | Info Security News (mailing list) |
| ISN | Integrated Services Network |
| ISN | Information Services Network (Sprint) |
| ISN | Internet Services Network |
| ISN | Impedance Stabilization Network (EMC testing) |
| ISN | Institut des Sciences Nucleaires (France) |
| ISN | Interstellar News (gaming) |
| ISN | International Society for Neuroethology (Lawrence, KS) |
| ISN | Istituto Di Scienze Neurologiche (Italy) |
| ISN | Internal Sequence Number |
| ISN | Item Serial Number |
| ISN | Idioma de Señas de Nicaragua (Spanish: Nicaraguan Sign Language) |
| ISN | International Sunspot Number |
| ISN | International Shopping Network (television company) |
| ISN | Israel Sports Network |
| ISN | Williston, ND, USA - Sloulin Field International (Airport Code) |
| ISN | Instituto de Servicios a la Nación (Spanish: Institute of Services to the Nation; Guatemala) |
| ISN | Instituto de Socorro a Náufragos (Portugal) |
| ISN | Inhibitory Synaptic Noise |
| ISN | Insurance Sales Network (Tampa, FL) |
| ISN | Interface Service Node |
| ISN | Idiopathic Sensory Neuropathy |
| ISN | Indefinite Secnav Allotments (US Navy) |
| ISN | Integrated Subscriber Node |
| ISN | Introsane News |
| ISN | Input Sub-Node |
| ISN | Integrated Service Node |
| ISN | International Student Network, Inc |
| ISN | Item or Sequence Number |