| Acronym | Definition |
|---|
| OHS | Occupational Health Services (various organizations) |
| OHS | Occupational Health and Safety |
| OHS | Office of Head Start (US DHHS) |
| OHS | Ohio Historical Society |
| OHS | Organ Historical Society |
| OHS | Oracle HTTP Server |
| OHS | Oregon Historical Society (Portland, OR) |
| OHS | Office of Homeland Security (USA) |
| OHS | Oral Health Section (various organizations) |
| OHS | Online Help System |
| OHS | Open Hypermedia Systems |
| OHS | Oklahoma Historical Society (Oklahoma City, OK) |
| OHS | Oswego High School |
| OHS | October Household Survey (South Africa) |
| OHS | Olympia High School (Washington) |
| OHS | Open Heart Surgery |
| OHS | Obesity-Hypoventilation Syndrome |
| OHS | Odessa High School (various locations) |
| OHS | Office of Highway Safety |
| OHS | Orange High School |
| OHS | Occupational Hygiene Services (various locations) |
| OHS | Osceola High School (Kissimmee, Florida) |
| OHS | Oconomowoc High School |
| OHS | Oceanside High School |
| OHS | Open Hypermedia System |
| OHS | Office of Health and Safety (US CDC) |
| OHS | Online High School (Stanford University) |
| OHS | Oakdale High School (Oakdale, CA) |
| OHS | Oakland High School (Oakland, CA) |
| OHS | Ontario Historical Society (Canada) |
| OHS | Ocular Histoplasmosis Syndrome |
| OHS | Okemos High School (Michigan) |
| OHS | Oxnard High School (Oxnard, CA) |
| OHS | Owatonna High School (Owatonna, MN) |
| OHS | Oakton High School (Vienna, VA) |
| OHS | Orem High School |
| OHS | Oviedo High School |
| OHS | Ottumwa High School |
| OHS | Open Hyperdocument System |
| OHS | Ossining High School (Ossining, NY, USA) |
| OHS | Ottawa Humane Society (Canada) |
| OHS | Okeechobee High School (Florida) |
| OHS | Oberlin High School (Oberlin, OH) |
| OHS | Ontario Health Survey |
| OHS | Oneida High School (Oneida, NY) |
| OHS | On Hand Stock (inventory) |
| OHS | Occipital Horn Syndrome |
| OHS | Ochsner Health System |
| OHS | Ozaukee Humane Society (est. 1977; Wisconsin Humane Society) |
| OHS | Orrville High School |
| OHS | Oceana High School |
| OHS | Orofino High School (Idaho) |
| OHS | Osbourn High School (Manassas, Virginia) |
| OHS | Omron Healthcare Singapore |
| OHS | Optimal Health Systems |
| OHS | Olympian High School (Chula Vista, CA) |
| OHS | Ohio Homeland Security (Columbus, OH) |
| OHS | Ontario Health Study (Canada) |
| OHS | Ottawa Horticultural Society |
| OHS | Ovonic Hydrogen Systems (Energy Conversion Devices; Auburn Hills, MI) |
| OHS | Ocoee High School (Florida) |
| OHS | Operator Head Space |
| OHS | Opelousas High School (Louisana) |
| OHS | Overhydrated Hereditary Stomatocytosis |
| OHS | Orestimba High School |
| OHS | Over Head Squat (weightlifting) |
| OHS | Order of the Holy Sepulchre (Equestrian Order of the Holy Sepulchre of Jerusalem, an order of knighthood of the Catholic church) |
| OHS | Osseo High School (Osseo, Minnesota, USA) |
| OHS | Order Handling System |
| OHS | Oilfields High School (California) |
| OHS | Oakfield High School (Oakfield, WI) |
| OHS | Oakley High School |
| OHS | Occupational Health Solutions Ltd (UK) |
| OHS | Office of Hispanic Services |
| OHS | Offerton High School (UK) |
| OHS | Ornamental Horticultural Society |
| OHS | Omega High School (Michigan) |
| OHS | Orchard Hills Basketball League (Milford, CT) |
| OHS | Oblates of the Holy Spirit (Christianity) |
| OHS | Open Here Stupid |
| OHS | One Hundredth Street (New York bus depot) |