| I&S | Interchangeability And Substitutability 
| Others |
| IS | Iceland
| Others |
| IS | Idiots for Socialism
| Others |
| IS | Ilta-Sanomat
| Others |
| IS | Image stabilization
| Others |
| IS | Image Stablizer
| Others |
| IS | Immediate Spin
| Others |
| IS | Immunosuppressant
| Others |
| IS | Impuesto sobre Sociedades
| Others |
| IS | In Situ
| Others |
| IS | Incentive Spirometer
| Others |
| IS | Income Statement
| Others |
| IS | Indentured Servant
| Others |
| IS | Independent Sector
| Others |
| IS | Indian Services
| Others |
| IS | Individual Savings
| Others |
| IS | Individuals Studying
| Others |
| IS | Industrial Supplies
| Others |
| IS | Infantile spasm
| Others |
| IS | Infinity Systems
| Others |
| IS | Informal Settler
| Others |
| IS | Information Science
| Others |
| IS | Information Separator
| Others |
| IS | Information Services
| Others |
| IS | Information Superiority
| Others |
| IS | Information System
| Others |
| IS | Infrastructure Services
| Others |
| IS | Ingredients Statement
| Others |
| IS | Injured Scrotum
| Others |
| IS | Innovative Sedan
| Others |
| IS | Insertion Sequence
| Others |
| IS | Insta
| Others |
| IS | Installation Support
| Others |
| IS | Integrated Sciences
| Others |
| IS | Integrated System
| Others |
| IS | Integrated Systems
| Others |
| IS | Interconnecting Station
| Others |
| IS | Interface Specification
| Others |
| IS | Intermediate State (in the Theory of Change)
| Others |
| IS | Intermediate System
| Others |
| IS | Internacional Socialista
| Others |
| IS | Internal Security
| Others |
| IS | Internal Stabilization
| Others |
| IS | International Security
| Others |
| IS | International Silver
| Others |
| IS | International Standard
| Others |
| IS | Internet Server
| Others |
| IS | Internet Service
| Others |
| IS | Intersil
| Others |
| IS | InterSwitch
| Others |
| IS | Intrinsically Safe
| Others |
| IS | Intuitive Studies
| Others |
| IS | Isernia (Provence)
| Others |
| IS | Isim
| Others |
| IS | Islamic State
| Others |
| IS | Islamic Studies
| Others |
| IS | Islamischer Staat
| Others |
| IS | It's Simple
| Others |
| IS | IX stand
| Others |
| IS | Izquierda Socialista
| Others |
| IS | Modula-3 Intermediate assembly file
| Others |