IIS

IIS may refer to:

Organizations

 * Indian Information Service, of the Government of India
 * 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

Other uses

 * Nissan Island Airport, Papua New Guinea, IATA airport code IIS
 * IIS, a ship prefix for ships of the Imperial Iranian Navy
 * IIS, shorthand for Sestertius, an ancient Roman coin