| Acronym | Definition |
|---|
| HMS | Hour Minute Second |
| HMS | Her/His Majesty's Ship (UK) |
| HMS | Harvard Medical School |
| HMS | Hendrick Motorsports (NASCAR) |
| HMS | Highly Migratory Species |
| HMS | Homestead-Miami Speedway |
| HMS | Hypermobility Syndrome (rheumatology) |
| HMS | Harrison Middle School |
| HMS | Hospital Management System |
| HMS | Hind Mazdoor Sabha (India) |
| HMS | Hind Mazdoor Sabha (Indian trade union) |
| HMS | Helmet Mounted Sight |
| HMS | Hotel Management System |
| HMS | Hospitality Management System |
| HMS | Heavy Melting Scrap |
| HMS | Holonic Manufacturing System |
| HMS | Haim-Munk Syndrome |
| HMS | Hull Mounted Sonar |
| HMS | HalbMastwurfSicherung (German: munter hitch belay) |
| HMS | Home Media Server |
| HMS | Hazardous Materials Safety |
| HMS | Heart, Mind and Soul |
| HMS | Huntington Middle School (California) |
| HMS | Health Market Science, Inc (King of Prussia, PA) |
| HMS | Hanford Meteorological Station |
| HMS | Holmes Middle School (Colorado Springs, Colorado) |
| HMS | Herndon Middle School (Herndon, Virginia) |
| HMS | Healthcare Management System |
| HMS | Highway Mobile Source |
| HMS | Hans/Hennes Majestäts Skepp (Swedish: His/Her Majesty's Ship) |
| HMS | Hahira Middle School (Hahira, GA) |
| HMS | Hard Metal System (Beyblade TV show & toys) |
| HMS | High Melting Scrap |
| HMS | Hrvatski Motociklisticki Savez (Croatian Motorcycle Federation) |
| HMS | Hidden Markov Source |
| HMS | Hampton Middle School (Allison Park, Pennsylvania) |
| HMS | Hart Middle School (Pleasanton, CA) |
| HMS | Head Media Spacing (magnetics) |
| HMS | Headend Management System (Cable TV) |
| HMS | His/Her Majesty Ship (UK) |
| HMS | Harden Middle School (California) |
| HMS | Hendersonville Middle School (North Carolina) |
| HMS | Height Management System (automobile/vehicle systems) |
| HMS | Hydrogen Mixing Studies |
| HMS | Hrvatski Macevalacki Savez (Croatian Fencing Federation) |
| HMS | Hazlet Middle School (New Jersey, USA) |
| HMS | Home Media Station (multimedia entertainment) |
| HMS | Her/His Majesty's Service |
| HMS | Hartman Middle School |
| HMS | Hardware Monitoring System |
| HMS | Hubble Middle School (Wheaton, IL) |
| HMS | Hanes Middle School (Winston-Salem, North Carolina) |
| HMS | Hybrid Management System |
| HMS | Harmonie Municipale de Sion |
| HMS | Handheld, Manpack and Small Form Fits (Joint Tactical Rado System Cluster 5) |
| HMS | Hallmark Management Services Inc |
| HMS | Human Safety Mandatory Modification |
| HMS | Hydro-Meteorological Station |
| HMS | Horace Mann School for the Deaf and Hard of Hearing (est. 1869; Allston, MA) |
| HMS | History of Mine Safety |
| HMS | Hawken Middle School (Lyndhurst, Ohio) |
| HMS | Human Metabolic Simulator |
| HMS | Heavy Materiel Supply |
| HMS | Harakat Mujtamaa As Silm (Movement of the Society for Peace) |
| HMS | His/Her Majesty's Submarine/Ship (UK) |