| IS&G | Idle Stop and Go 
| Others |
| ISG | Identification Systems Group
| Others |
| ISG | Idle Stop & Go
| Others |
| ISG | Idle Stop Go
| Others |
| ISG | Illinois Student Government
| Others |
| ISG | Imperial System Guard
| Others |
| ISG | In Sixth Gear
| Others |
| ISG | Inane Strategy Guessw
| Others |
| ISG | Independent Scientific Group (advises government on the control of tuberculosis in cattle in the UK)
| Others |
| ISG | Indian Snake Giver
| Others |
| ISG | Individual Salary Gap
| Others |
| ISG | Industrial Stakeholders Group
| Others |
| ISG | Industry Specific Group
| Others |
| ISG | Industry Specification Group
| Others |
| ISG | Infinite Sword Glitch
| Others |
| ISG | Information Security Group
| Others |
| ISG | Information Services Group
| Others |
| ISG | Information Specialists Group
| Others |
| ISG | Information Storage Group
| Others |
| ISG | Information Synchronization Group
| Others |
| ISG | Information Systems Group
| Others |
| ISG | Information Sytem Generator
| Others |
| ISG | Innocent Sinners Guild
| Others |
| ISG | Innovated Sports Group
| Others |
| ISG | Innovative Sport Group
| Others |
| ISG | Innovative Sports Group
| Others |
| ISG | Innovative Strategic Growth
| Others |
| ISG | Innovative Structures Group
| Others |
| ISG | Insight Sourcing Group
| Others |
| ISG | Insolvency Services Group
| Others |
| ISG | Inspire Share Give
| Others |
| ISG | Institute for Security Governance
| Others |
| ISG | Institute for Systems Genomics
| Others |
| ISG | Insulated Shell Garment
| Others |
| ISG | Insurance Specialty Group
| Others |
| ISG | Intake Sound Generator
| Others |
| ISG | Integrated Security Group
| Others |
| ISG | Integrated Solutions Group
| Others |
| ISG | Integrated Starter Generator
| Others |
| ISG | Integrated Starter-Generator
| Others |
| ISG | Integrity Staffing Group
| Others |
| ISG | Intelligent Service Gateway
| Others |
| ISG | Intelligent Services Gateway
| Others |
| ISG | Intelligent Stop And Go
| Others |
| ISG | Interim Staff Guidance
| Others |
| ISG | Intermarket Surveillance Group
| Others |
| ISG | International Sales Group
| Others |
| ISG | International School of Gemology
| Others |
| ISG | International Society for Gerontechnology
| Others |
| ISG | International Solutions Group
| Others |
| ISG | International Sommelier Guild
| Others |
| ISG | International Steel Group
| Others |
| ISG | International Support Group
| Others |
| ISG | Internet Safety Group
| Others |
| ISG | Internet Scrubbing Gateway
| Others |
| ISG | Internet Services Group
| Others |
| ISG | Interpreting Stakeholder Group
| Others |
| ISG | Interservice Steering Group
| Others |
| ISG | Inverse Signal Generator
| Others |
| ISG | Investor Stewardship Group
| Others |
| ISG | Invicible Sword Goddess
| Others |
| ISG | Iraq Search Group
| Others |
| ISG | Iraq Study Group
| Others |
| ISG | Iraq Survey Group
| Others |
| ISG | Iraqi Survey Group
| Others |
| ISG | ISG Railways
| Others |
| ISG | Ishigaki, Japan
| Others |
| ISG | Islamic Society of Germantown
| Others |
| ISG | ISTP Scheduling Group
| Others |
| ISG | Isuzu Suppliers Group
| Others |
| ISG | Software Group
| Others |