| Abbreviation | Definition |
|---|---|
| HYC | Heikendorfer Yacht Club |
| HYC | Highland Yacht Club |
| HYC | Hingham Yacht Club |
| HYC | Hobcaw Yacht Club |
| HYC | Houston Yacht Club |
| HYC | Howth Yacht Club |
| HYC | Hudson Yacht Club |
| HYC | Hyannis Yacht Club |
| HYC | Hyannis Yacht Club's |
| IAC | International Aerobatic Club |
| IACES | Irish American Club East Side |
| IACL | Italian American Club of Livonia |
| IAOC | International Arabian Oryx Club |
| IAPC | International Association of Press Clubs |
| IAPSC | International Association of Pipe Smokers Clubs |
| IASC | Illinois Association of Snowmobile Clubs |
| IBBC | Interdental Brush Buyers Club |
| IBC | Icy Blackhandofdeath Club |
| IBEC | International Business and Economics Club |
| IBSC | Ikan Bilis Swimming Club |