| Acronym | Definition |
|---|
| HOS | Hostile |
| HOS | Houston (Amtrak station code; Houston, TX) |
| HOS | Hospitality |
| HOS | Hours of Service |
| HOS | Hosea |
| HOS | House of Secrets |
| HOS | Head of Section |
| HOS | Head of Scrutiny (UK) |
| HOS | Holt-Oram Syndrome |
| HOS | Human Organ Systems (class) |
| HOS | Head of State (political title) |
| HOS | Head of School |
| HOS | Higher Order Statistics |
| HOS | High Level Operations Software |
| HOS | Hidden Object Scene (gaming) |
| HOS | Health Outcomes Survey (Medicare survey) |
| HOS | Higher-Order Statistics |
| HOS | Higher Order Surface |
| HOS | Head of Sales (various locations) |
| HOS | Hands on Sacramento (California) |
| HOS | Home Orchard Society |
| HOS | Hands-On Science (educational program) |
| HOS | Heckscher-Ohlin-Samuelson (economics) |
| HOS | High Order Software |
| HOS | Host Operating System |
| HOS | Hrvatske Obrambene Snage (Croatian Defence Forces) |
| HOS | High Order Shims (imaging) |
| HOS | Higher Order Software |
| HOS | Halls of Stone (World of Warcraft) |
| HOS | Home Of Selection |
| HOS | Human Operator Simulator |
| HOS | Husband Over Shoulder |
| HOS | Hrvatski Odbojkaški Savez (Croatian Volleyball Federation) |
| HOS | Healing Our Spirit (Vancouver, BC) |
| HOS | Head Office System |
| HOS | Home Office Specimen (life/health insurance underwriting) |
| HOS | Hardy Orchid Society (UK) |
| HOS | Helicopter Oxygen System |
| HOS | Harnessing of Spirit (gaming) |
| HOS | Holiday Oceanview Samal |
| HOS | Hang Off Sub (oilfield) |
| HOS | Highway Operations System |
| HOS | Heavy Oilfield Services (gas compressor) |
| HOS | Horizontal Over Scan (TV) |
| HOS | Helicopter Observation System |