IIS may refer to:
Organizations Indian Information Service, of the Government of India Institute of Industrial Science, Japan Institute of Information Scientists, a professional association now merged into the Chartered Institute of Library and Information Professionals, UK Institute of Ismaili Studies, in London, England Iraqi Intelligence Service, the main state intelligence organization in Iraq under Saddam Hussein.
Technology Immunization information system, an information system that collects vaccination data Improved iterative scaling, an algorithm in statistics Internet Information Services, Microsoft web server software Issues in Information Systems, a journal published by the International Association for Computer Information Systems
Other uses IIS, IATA airport code for Nissan Island Airport, Papua New Guinea IIS, a ship prefix for ships of the Imperial Iranian Navy IIS, shorthand for sestertius, an ancient Roman coin Insulin/IGF-1 signalling pathway, signaling intracellular mechanism involved in longevity of organisms
See also
ISS (disambiguation) I²S, an electrical serial bus interface standard