| Abbreviation | Definition |
|---|---|
| HISC | Hayling Island Sailing Club |
| HISC | Hillsboro Inlet Sailing Club |
| HMT | His Majesty's Trawler |
| HMY | Her Majesty's Yacht |
| HOBA | Hop On a Boat Anywhere |
| HRCS | Hudson River Community Sailing |
| HRFs | Hyperbaric Reception Facilities |
| HSBH | Haleiwa Small Boat Harbor |
| HSBH | Honokohau Small Boat Harbor |
| HSCA | Hawaiian Sailing Canoe Association |
| HSPB | High Speed Patrol Boat |
| HTSC | Harwich Town Sailing Club |
| IBBI | Independent Boat Builders Inc |
| ICSA | Inter Collegiate Sailing Association |
| IDBA | Irish Dragon Boat Association |
| IDBF | International Dragon Boat Federation |
| IDBR | Independence DragoN Boat Regatta |
| IFS | Inshore Fire Support ship |
| ILSBC | International Lake Superior Board of Control |
| ILWU | International Longshore and Warehouse Union |