| Abbreviation | Definition |
|---|---|
| HNS | Hispanic Neuropsychological Society |
| HNS | Historical Novel Society |
| HNS | hmong national society |
| HNS | Holy Name Society |
| HODS | Halachic Organ Donor Society |
| HOPAS | Haryana Overseas Placement Assistance Society |
| HOS | Hellenic Ornithological Society |
| HOTS | Hamilton Ohio Trainwatchers Society |
| HPAS | Harford Photographic Arts Society |
| HPAS | High Peaks Audubon Society |
| HPAS | Highlands Plateau Audubon Society |
| HPD | Croatian Psychological Society |
| HPD | Hrvatsko Psiholoako Druatvo |
| HPD | Hrvatsko Psiholoko Drutvo |
| HPD | Hrvatsko Psihološko Društvo |
| HPGS | Hawaii Pacific Gerontological Society |
| HPS | Homing Pigeon Society |
| HPSI | Hellenic Professional Society of Illinois |
| HPSO | Hardy Plant Society of Oregon |
| HPSW | Hardy Plant Society of Washington |