| ICG | I Can't Grade 
| Others |
| ICG | I Consulting Group
| Others |
| ICG | Ibm Cloud Garage
| Others |
| ICG | Ideal Class Group
| Others |
| ICG | Illinois Central Gulf
| Others |
| ICG | Illinois Central Gulf Railroad (Canadian National Railway)
| Others |
| ICG | In-flight Coverall Garment
| Others |
| ICG | Independent Carton Group
| Others |
| ICG | Independent Coin Graders
| Others |
| ICG | Independent Curriculum Group
| Others |
| ICG | Indian Coast Guard
| Others |
| ICG | Indonesian Coast Guard
| Military, Navy |
| ICG | Indoor Cycling Group
| Others |
| ICG | Industrial Computer Group
| Others |
| ICG | Innovative Construction Group
| Others |
| ICG | Inscriptiones Christianae Graecae
| Others |
| ICG | Insight Catastrophe Group
| Others |
| ICG | Insight Creative Group
| Others |
| ICG | Instant Coffee Grounds
| Others |
| ICG | Instant Coin Gauge
| Others |
| ICG | Institutional Client Group
| Others |
| ICG | Institutional Clients Group
| Others |
| ICG | Instructional Computer Group
| Others |
| ICG | Intellectual Conversation Group
| Others |
| ICG | Intelligence Convergence Group
| Others |
| ICG | Interactive Computer Graphics
| Others |
| ICG | Interagency Core Group
| Others |
| ICG | Interface Control Group
| Others |
| ICG | Interior Construction Group
| Others |
| ICG | Intermediate Capital Group
| Others |
| ICG | International Capital Group
| Others |
| ICG | international Charles Gaston
| Others |
| ICG | International Cinematographers Guild
| Others |
| ICG | International Clubmakers Guild
| Others |
| ICG | International Coal Group
| Others |
| ICG | International Coalition for Good
| Others |
| ICG | International Communications Group
| Others |
| ICG | International Computers Group
| Others |
| ICG | International Conference on Genomics
| Others |
| ICG | International Coordinating Group
| Others |
| ICG | International Coordination Group
| Others |
| ICG | International Costumers Guild
| Others |
| ICG | International Costumers' Guild
| Others |
| ICG | International Crisis Group
| Policy, Organization, NGO, Research Center |
| ICG | International Currency Grading
| Others |
| ICG | Internet Cat Gestapo
| Others |
| ICG | Internet Creators Guild
| Others |
| ICG | Intersector Coordination Group
| Others |
| ICG | Invisible Ceiling Glitch
| Others |
| ICG | Islandora Collaboration Group
| Others |