| Abbreviation | Definition |
|---|---|
| HLCC | Highland Lakes Computer Club |
| HLCCA | Homer Laughlin China Collectors Association |
| HLCK | Holland Lop Club of Kentucky |
| HLJ | HobbyLink Japan |
| HMAC | Hobart Model Aero Club |
| HMANA | Hawk Migration Association of North America |
| HMC | Hubcaps Mini Club |
| HMR | Historical Medieval Recreation |
| HMSC | Home Metal Shop Club |
| HMSC | Homeschooling Mom's Social Club |
| HN | Habibi Net |
| HO | Half Old |
| HOB | House Of Balsa |
| HOBBY | Hobbies |
| HPC | Historical Piano Collection |
| HPSC | Hard Pipe Swingers Coalition |
| HPSC | High Point Swim Club |
| HQB | Honored Queen's Ball |
| HRC | Hampton Roads Couples |
| HRH | Hot Rod Helicopter |