| Acronym | Definition |
|---|
| HL | Hill |
| HL | Half Life |
| HL | High Level |
| HL | Higher Level (course) |
| HL | House of Lords |
| HL | Hockey League |
| HL | Hearing Loss |
| HL | Hyperlipidemia |
| HL | Hugh Laurie (actor) |
| HL | Heilig (German: Holy) |
| HL | Hot Line |
| HL | Highlander (cartoon) |
| HL | Horizon League (formerly Midwest Collegiate College) |
| HL | Heath Ledger (actor) |
| HL | Highline |
| HL | Healthy Living |
| HL | Heavy Lift |
| HL | Holiday Lights |
| HL | Hasta Luego |
| HL | Hellgate London (videogame) |
| HL | Hansestadt Lübeck (architects; Germany) |
| HL | Humane Letters |
| HL | Houlihan Lokey (Los Angeles, CA) |
| HL | Hit List |
| HL | Hard Labor |
| HL | Hectolitre |
| HL | Hydrogen Line |
| HL | Horseland (game) |
| HL | Huey Lewis |
| HL | High Land |
| HL | Hinge Line |
| HL | Hoc Loco (Latin: In This Place, epigraphy) |
| HL | Hearing Level |
| HL | Halbleiter (German: semiconductor) |
| HL | High Limit |
| HL | Head Lines |
| HL | Home Leave |
| HL | Heel Line |
| HL | Head Librarian |
| HL | Heparin Lock (catheter attachment) |
| HL | Hydrated Lime |
| HL | Holiday Leave |
| HL | Head Linesman (football) |
| HL | Hepatic Triglyceride Lipase |
| HL | Hospitality and Leisure |
| HL | Hannoversche Leben (German Life Insurance Company) |
| HL | Hired Labor (USACE) |
| HL | High Temperature Limit |
| HL | Hypotenuse Leg (geometry) |
| HL | Hepatic Lipidosis |
| HL | Humerus Length (fetal) |
| HL | Hospitalisation Libre (French) |
| HL | Hysteresis Loss |
| HL | Hall Lantern (elevators) |
| HL | Hochleistungsmotor (German: High-speed engine) |
| HL | Hac Lege (Latin: According to This Law, epigraphy) |
| HL | Honolulu Laboratory |
| HL | Hunt Library (Carnegie Mellon University) |
| HL | Hundred Liters |
| HL | Hogwartslive (Harry Potter game) |
| HL | Hydraulic Length |
| HL | Latent Hypermetropia |
| HL | Hierarchical Leader-based (routing scheme) |
| HL | Louro Quer Bolacha (Portugal) |
| HL | Harmonie Laval (Laval, Quebec, Canada) |