| Acronym | Definition |
|---|
| HM | Her/His Majesty |
| HM | Heavy Metal |
| HM | Health Monitoring |
| HM | How Much |
| HM | Hannah Montana (Disney Channel character) |
| HM | Harvest Moon (video game by Natsume and Victor Interactive) |
| HM | Half Marathon (race) |
| HM | Headmaster |
| HM | Herbal Medicine |
| HM | Hospitality Management (various schools) |
| HM | History in the Making |
| HM | Honorable Mention (various organizations) |
| HM | Hakuna Matata (Swahili: There Are No Worries) |
| HM | Hennes & Mauritz |
| HM | Haunted Mansion (Disney) |
| HM | High Maintenance |
| HM | Heard and McDonald Islands (ISO country code) |
| HM | Hazardous Material (HAZMAT) |
| HM | Hazardous Material |
| HM | Horace Mann (various organizations) |
| HM | Holistic Medicine |
| HM | Hammer Mill |
| HM | Homework Diary |
| HM | Hindustan Motors |
| HM | Hollow Metal |
| HM | Hectometer |
| HM | Harmonic Mean |
| HM | Home Maker |
| HM | Harmonic Motion |
| HM | Horse's Mouth |
| HM | Hidden Mickeys (in Disney theme parks) |
| HM | Higher Mind (Sri Aurobindo, Indian Yogi and philosopher) |
| HM | Hand Motion (ophthalmological test of visual acuity) |
| HM | Hydraulic Machine (various companies) |
| HM | Hinge Mount (various companies) |
| HM | Hotel Management (various organizations) |
| HM | Houghton Mifflin Company |
| HM | Half Mirror |
| HM | Air Seychelles (IATA airline code) |
| HM | Highly Magnified |
| HM | Henry Molaison (memory loss patient) |
| HM | Human Milk |
| HM | Hard Music |
| HM | Hidden Machine (Pokémon) |
| HM | History Module (Honeywell) |
| HM | History Matters (educator resources website) |
| HM | Helicopter Mine Countermeasures Squadron (US Navy aviation unit designation used from 1971 to present) |
| HM | Historia Mexicana |
| HM | Holy Moley |
| HM | Hoochie Mama |
| HM | Holy Mackerel |
| HM | Hotto Motto (Japanese fast food chain) |
| HM | High Moment (chemistry) |
| HM | Hokkaido Museum |
| HM | Hug Me |
| HM | Hey Mercedes (band) |
| HM | Hindu Munnani (Tamil Nadu movement) |
| HM | Heard & McDonald Islands (Kerguelen, Including Prince Edward & Crozetis Islands) |
| HM | Hyperbolic Metamaterial |
| HM | Helper Monkey |
| HM | Heavy Magnum (ammunition) |
| HM | Hiring Manager |
| HM | Hold Model |
| HM | Hot Metal |
| HM | Handmaids of Mary |
| HM | Hyperbaric Medicine |
| HM | Haughton-Mars |
| HM | Howling Mad (Murdock) |
| HM | Horizontal Measure |
| HM | Howler Monkey (wrestling) |
| HM | Hare Majesteit (Her Majesty) |
| HM | Hydromechanical |
| HM | Hole Montes, Inc (Naples, FL) |
| HM | Herrschende Meinung (German: prevailing opinion; legal) |
| HM | Humanist Manifesto (ideology) |
| HM | Hydrogen Maser |
| HM | Hôpital Militaire |
| HM | Hans/Hennes Majestät (Swedish: His/Her Majesty) |
| HM | Horizontal Multiplier (NIOSH) |
| HM | Hamilton Sector (Lester B. Pearson International Airport; Canada) |
| HM | Heavens Metal (Magazine) |
| HM | Hardness Maintenance |
| HM | Hotel Margherita (Isle of Capri, Italy) |
| HM | Hybrid Magnetic |
| HM | Hayakawa Mystery (Japanese book series) |
| HM | Hippie Maffia |
| HM | Hydrogen Monitor |
| HM | Hum Modulation |
| HM | Hectameter |
| HM | (USN Rating) Hospital Corpsman |
| HM | Halo Messenger (website) |
| HM | Haptic Modeler (Surface Model Level Navigation) |
| HM | Honesta Matrona (Latin: Virtuous Lady, epigraphy) |
| HM | Hunter Mountain Ski Slope |
| HM | Horner Museum (Oregon State University) |