| Acronym | Definition |
|---|
| Hg | Hydrargentum/Hydrargyrion (Mercury) |
| Hg | Mercury (chemical element) |
| Hg | Hemoglobin |
| Hg | Harrogate (postcode, United Kingdom) |
| Hg | Human Genome |
| Hg | Head Gasket (motor) |
| Hg | Home and Garden |
| Hg | Holy Grail |
| Hg | Hot Girl |
| Hg | Hermione Granger (Harry Potter) |
| Hg | Head Gear |
| Hg | High Gain |
| Hg | Home Grown |
| Hg | Home Grown (band) |
| Hg | Home Guard (UK) |
| Hg | Hard Gay (stage persona; Masaki Sumitani) |
| Hg | Heaven's Gate (cult) |
| Hg | Hellgate: London |
| Hg | High Gear |
| Hg | Hyperemesis Gravidarum |
| Hg | Hot Gas |
| Hg | Hand Grenade |
| Hg | Hyperglide (Shimano Chain and Cogs) |
| Hg | Hour Glass |
| Hg | Hectogram |
| Hg | Hunger Games (Suzanne Collins book) |
| Hg | Hello Goodbye (Beatles song) |
| Hg | Hydrogen Generator |
| Hg | Heavy Gear (computer game) |
| Hg | Home Gateway |
| Hg | Hilton Group (hotels) |
| Hg | Highly Gifted |
| Hg | HeavenGames (gaming site) |
| Hg | Hardgamers (web community) |
| Hg | Harvestgain (gaming, Asheron's Call) |
| Hg | Horizontal Gaze (test) |
| Hg | Hauptgefreiter (German military) |
| Hg | Harmonic Generator |
| Hg | Half-Giant (Utopia game) |
| Hg | Horizontal Gradient (gravity and magnetics) |
| Hg | Hill Giant (Everquest game creature) |
| Hg | Herpes Gladiatorum (viral infection) |
| Hg | High Grounds |
| Hg | High Gun (shooting award) |
| Hg | Haiti International Airline (IATA airline code) |
| Hg | Homing Guidance |
| Hg | Headed & Gutted (seafood) |
| Hg | HealthGrades, Inc. |
| Hg | Hudson Guild (Settlement House, New York City) |
| Hg | Humana Global |
| Hg | His/Her Grace |
| Hg | Hanggnome (computer game) |
| Hg | Holographic Goggles |
| Hg | Hieros Gramos |
| Hg | Helleseth-Gong Coding Sequence |