| Abbreviation | Definition |
|---|---|
| IFO | Intermediate Fuel Oil |
| IFRA | International Fragrance Association |
| IFS | Independent Front Suspension |
| IG | Imitation Gold (or Pinchbeck) |
| IG | Imperial Glass |
| IG | Insulated Glass |
| IG | Integrated Gearing |
| IG | Internalization Gap |
| IGJ | Imitation Gold Jewels |
| IGR | Import Goods Received |
| IGT | Industrial Gas Turbines |
| IGWO | in good working order |
| IGZO | Indium Gallium Zinc Oxide (one technology used in manufacturing LCD's, e.g. by Sharp) |
| IHO | Industrial Heating Oil |
| IHP | Indicated HorsePower |
| IHS | Infrared Heat System |
| IHS | Integrated Heat Spreader |
| IHSB | Insulated Heat Sink Box |
| IHTM | Inhouse Test Method |
| IIMA | International Iron Metallics Association |