| Acronym | Definition |
|---|
| IIS➣Internet Information Services (Microsoft) |
| IIS➣Institute of Industrial Science (Japan) |
| IIS➣Institute of International Studies |
| IIS➣Institut für Integrierte Schaltungen (German: institute for integrated circuits) |
| IIS➣Immunization Information Systems |
| IIS➣Institute of Ismaili Studies (London, UK) |
| IIS➣Institute for Social Innovation (Escuela Superior de Administración y Dirección de Empresas) |
| IIS➣International Indian School (various locations) |
| IIS➣Integrated Information System |
| IIS➣Indian Institute of Science |
| IIS➣Instance Item Structure |
| IIS➣Identity Integration Server |
| IIS➣Institute for Integrated Circuits |
| IIS➣Internet Information Services |
| IIS➣Internet Information Server |
| IIS➣Iraqi Intelligence Service |
| IIS➣Instituto de Investigaciones Sociales (Costa Rica) |
| IIS➣International Insurance Society (New York, NY) |
| IIS➣Investors in Software (association) |
| IIS➣Fraunhofer Institut Integrierte Schaltungen |
| IIS➣International Integrated Solutions (consulting agency) |
| IIS➣Inter Ikea Systems (Netherlands) |
| IIS➣Investigator Initiated Study (healthcare) |
| IIS➣Information Institute of Syracuse |
| IIS➣Internet Information System |
| IIS➣Institute of Information Scientists |
| IIS➣Institutional Investment Services |
| IIS➣Irish Institute of Sport (est. 2006; Ireland) |
| IIS➣Inter-IC Sound (aka I2S) |
| IIS➣Investment Insurance Services (various locations) |
| IIS➣Interactive Internet Sports |
| IIS➣Ingeniero Industrial Y de Sistemas (Mexico) |
| IIS➣Intelligence Information System |
| IIS➣Ignition Interlock Symposium |
| IIS➣Irish Institution of Surveyors (est. 1989; Ireland) |
| IIS➣Intelligent Image Stabilization (photography) |
| IIS➣Industrial Injuries Scheme |
| IIS➣International Investigation Services |
| IIS➣Information and Intelligence Systems |
| IIS➣Initiative for Inclusive Security (Hunt Alternatives Fund) |
| IIS➣Infrastructure and Information Systems (division) |
| IIS➣Industry Information Security |
| IIS➣Image Integration Systems, Inc. |
| IIS➣International Iguana Society |
| IIS➣Inflationary Impact Statement |
| IIS➣Incoming Inspection Standard |
| IIS➣Interagency and International Services (Army Corps of Engineers, Directorate of Military Programs) |
| IIS➣Intelligent Inference Systems Corporation |
| IIS➣IBM Information Services |
| IIS➣Interagency Intergovernmental Support (various organizations) |
| IIS➣Intelligent Internet Strategies |
| IIS➣Interface Implementation Specification |
| IIS➣Israel Information Service |
| IIS➣Irreducible Inconsistent Subsystem (linear programming) |
| IIS➣Investor Information Service |
| IIS➣Industrial Integration Services |
| IIS➣Information Indicate String |
| IIS➣Institute of Informatic Systems (Novosibirsk, Russia) |
| IIS➣Imperial Investor Service |
| IIS➣Integrated Information Store |
| IIS➣Intelligence Systems Secretariat |
| IIS➣Information Integrity Services |
| IIS➣ISPO Information System |
| IIS➣IHI (Ishikawajima-Harima Heavy Industries) Infrastructure Systems (Japan) |
| IIS➣Imaging Index System |
| IIS➣Interfaces to Information Sources |
| IIS➣Insurance Information Strategy |
| IIS➣Institutional Improvement Specialist (education) |
| IIS➣Interim Instrumentation System |
| IIS➣Israel Immunological Society |