| Acronym | Definition |
|---|
| IG | Instagram |
| IG | Interest Group |
| IG | I Guess |
| IG | In Game (online gaming) |
| IG | Inspector General |
| IG | Ignore |
| IG | Installation Guide |
| IG | Implementation Guide |
| IG | Iron Golem (gaming) |
| IG | Immunoglobulin |
| IG | Investors Group |
| IG | Ilford (postcode, United Kingdom) |
| IG | Information Governance (various organizations) |
| IG | Insulating Glass |
| IG | Igloo (pressurized and thermally controlled environment for Spacelab pallet subsystems) |
| IG | Italian Greyhound |
| IG | iGoogle (personalized Google homepage) |
| IG | Industriegewerkschaft (Industrial Labor Union) |
| IG | Immune Globulin |
| IG | Investment Grade |
| IG | Independent Group (various organizations) |
| IG | Index Glycémique (French: Glycemic Index) |
| IG | Infidelguy (website) |
| IG | Instituto Geofísico |
| IG | Imperial Guard (game) |
| IG | Intelligence Group |
| IG | Image Generator |
| IG | Inherently Governmental |
| IG | Irish Guards (A British Regiment) |
| IG | Intra-Gastric (healthcare) |
| IG | Inspector Gadget (cartoon) |
| IG | International Ground (commerical carriage modality; FedEx) |
| IG | Islamic Group |
| IG | Inspection Générale (French: General Inspectorate) |
| IG | Intrinsic Gettering |
| IG | Infogrames (European software company) |
| IG | Inscriptiones Graecae (definitive collection of ancient manuscripts) |
| IG | Interactive Graphics |
| IG | Isolated Ground |
| IG | Instructor Guide |
| IG | Infinite Green (Internet radio) |
| IG | Interglobal |
| IG | Income Generation |
| IG | Institute of Genetics (Canada) |
| IG | Interagency Group |
| IG | Intern Geologist (professional status) |
| IG | Induction Generator |
| IG | Imperial Gallon |
| IG | Interface Group |
| IG | Inertial Guidance |
| IG | IndyGo (mass transit company) |
| IG | Inspecciones Globales (Spanish: Global Inspections; Guatemala) |
| IG | Inner Guard (Masonry) |
| IG | Interdepartmental Group |
| IG | Information Granulation |
| IG | Index-Linked Gilts (finance) |
| IG | Indiangrass (botany) |
| IG | Im Generalstab (German: General-Staff Member) |
| IG | Interoperability Group |
| IG | Instructor in Gunnery (Canadian and British Military) |
| IG | Inspectoría General (Guatemala special police division) |
| IG | Interglide (Shimano Chain and Cogs) |
| IG | Inverse Gain |
| IG | Imperial Games (gaming fansite network) |
| IG | InterGOV International |
| IG | Interconnecting Group |
| IG | Illumined Gaming (message board) |
| IG | Inwent Germany |
