| Abbreviation | Definition |
|---|---|
| GAIN | Gator Advertizing Information Network |
| GALA | Global Advertising Lawyers Alliance |
| GBCA | Greater Boston Cable Advertising |
| GDA | Greatest Dane Advertising |
| GID | Guaranteed Income Data |
| GWA | Gregory Welteroth Advertising |
| GYD | Grow Your Dreams |
| HAAA | Halifax Area Advertising Authority |
| HAP | Human Advertising Project |
| IAA | International Advertising Association |
| IAAS | Institute of Advanced Advertising Studies |
| IAB | Interactive Advertising Bureau |
| IAB | International Advertising Bureau |
| IBAA | Indoor Billboard Advertising Association |
| IBD | It's Been Done |
| ICAD | Institute of Creative Advertising and Design |
| ICAD | Institute Of Creative Advertising Design |
| ICAN | Iowa Cable Advertising Network |
| IFA | Identifier For Advertising |
| IFA | Independent Field Advertiser |