| Abbreviation | Definition |
|---|---|
| HOBC | Houston Oilman's Bass Club |
| HOC | Harlequins Orienteering Club |
| HOC | Herts Orienteering Club |
| HOC | Houston Orienteering Club |
| HORC | Hellenic Offshore Racing Club |
| HOSARC | Hall of Science Amateur Radio Club Inc. (Kew Gardens, NY) |
| HPCA | Highland Park Club Apartments |
| HPCV | Hyundai Palisade Club Vietnam |
| HPF | Harry Potter Fan |
| HPFC | Harry Potter Fan Club |
| HPFC | Harvey Penick Footgolf Club |
| HPFC | Henwood Park Football Club |
| HPFC | Highams Park Fencing Club |
| HPFC | Highline Premier Football Club |
| HPGCC | Haile Plantation Golf & Country Club (Gainesville, FL) |
| HPIC | Highland Park Improvement Club |
| HPIC | Huddersfield Photo Imaging Club |
| HPLTC | Holland Park Lawn Tennis Club |
| HPTC | Highland Park Tennis Club |
| HRBC | Hampton Roads Bird Club |