| Abbreviation | Definition |
|---|---|
| HSMC | Humane Society of Marion County |
| HSMC | Humane Society of Montgomery County |
| HSMC | Humane Society of Morgan County |
| HSME | Henley Society of Meccano Engineers |
| HSME | Hereford Society of Model Engineers |
| HSNA | Haydn Society of North America |
| HSNA | Hindu Society of North America |
| HSNC | Hindu Society of North Carolina |
| HSNC | Humane Society of Navarro County |
| HSNC | Humane Society of the Nature Coast |
| HSNM | Historical Society of New Mexico |
| HSNM | Humanist Society of New Mexico |
| HSNP | Hawaii Society of Naturopathic Physicians |
| HSNT | Humane Society of North Texas |
| HSO | Houston Society of Otolaryngology |
| HSOB | Historical Society of Bloomfield |
| HSOD | Historical Society of Ogden Dunes |
| HSOG | Hellenic Society of Obstetrics and Gynecology |
| HSOMS | Houston Society of Oral and Maxillofacial Surgeons |
| HSOP | Humane Society Of Parkersburg |