| Abbreviation | Definition |
|---|---|
| HIWG | History of the Imperium Working Group |
| HLBA | Historical Look Back Approach |
| HLCD | History and Literature Cataloging Division |
| HLCS | Historical Literary and |
| HLI | History Leadership Institute |
| HLRC | Historical Landmark and Records Commission |
| HLRC | Historical Landmarks and Records Commission |
| HM | The aberration from the YouTube web series “History Matters” |
| HMAP | History of Marine Animal Populations |
| HMB | Historical Medieval Battle |
| HMD | History of Medicine Days |
| HMD | History of Medicine Division |
| HMGS | Historical Miniatures Gaming Society |
| HMRS | Historical Model Railway Society |
| HMTDJRMTAWBDNBTHBDJAPIVH | Happily Married To DJ Rukkus: Most Talented Award Winning Best Drum 'N' Bass, Tech House, & Beats DJ Artist Producer in Vinyl’s History ❤️ |
| HNHC | Holmesdale Natural History Club |
| HNHM | Hungarian Natural History Museum |
| HNR | Historical Network Research |
| HNS | History News Service |
| HNY | History of New York |