| IIS | Identity Integration Server 
| Others |
| IIS | Idiot's Information Server
| Others |
| IIS | Idiotic Institute of Stupidity
| Others |
| IIS | Idiotic Intrusion Service
| Others |
| IIS | Images and Identity Survey
| Others |
| IIS | Immunization Information System
| Others |
| IIS | Incompetent Internet Server
| Others |
| IIS | Incredibly Insecure Stuff
| Others |
| IIS | Indian Information Service
| Others |
| IIS | Induced Is Shared
| Others |
| IIS | Infinity International Society
| Others |
| IIS | Information and Intelligent Systems
| Others |
| IIS | Innovative Information Solutions
| Others |
| IIS | Insecure Infiltration System
| Others |
| IIS | Inside Information Systems
| Others |
| IIS | Inspection Item Sheet
| Others |
| IIS | Instance Item Structure
| Others |
| IIS | Instant Insecure Server
| Others |
| IIs | Institute for Integrated Circuits
| Others |
| IIS | Institute for Intelligent Systems
| Others |
| IIS | Institute of Information Scientists
| Others |
| IIS | Institute of Ismaili Studies
| Others |
| IIS | Integrated Information Services
| Others |
| IIS | Integrated Interchip Sound
| Others |
| IIS | Integrated International School
| Others |
| IIS | Integrated Inventory Solutions
| Others |
| IIS | Intelligence Information System
| Others |
| IIS | Inter-vehicular Information System
| Others |
| IIS | Interactive Internet Sports
| Others |
| IIS | International Iguana Society
| Others |
| IIS | International Insurance Society
| Others |
| IIS | International Islamic School
| Others |
| IIS | International Island Sportsbook
| Others |
| IIS | International Isotope Society
| Others |
| IIS | Internet Infected Server
| Others |
| IIS | Internet Information Server
| Others |
| IIS | Internet Information Services
| Others |
| IIS | Internetstiftelsen i Sverige
| Others |
| IIS | Inverted Index Search
| Others |
| IIS | Iraqi Intelligence Service
| Others |
| IIS | Irish Intelligence Services
| Others |
| IIS | Irreducible Infeasible Subsystem
| Others |
| IIS | Is It Secure
| Others |
| IIS | It Isn't Safe
| Others |
| IIS | It Isn't Secure
| Others |
| IIS | Izod Indycar Series
| Others |
| IIS | Nissan Island Airport
| Others |
| IIS | Nissan Island, Papua New Guinea
| Others |