OHS may refer to:

Medicine

• Obesity hypoventilation syndrome
• Occipital horn syndrome

Other

• Occupational safety and health
• Occupational Health Science, a scholarly journal published by the Society for Occupational Health Psychology
• Oh's, a brand of cereals
• Oracle HTTP Server
• Over head system, a power supply scheme for bumper cars

Organizations

• Ochsner Health System
• Office of Homeland Security, Office of the Executive Branch of the United States, precursor to the Department of Homeland Security
• Ohio Historical Society
• Oklahoma Historical Society
• Ontario Handweavers & Spinners
• Oregon Historical Society
• Organ Historical Society, in Villanova, Pennsylvania, United States
• Ottawa Humane Society
• Oxford Harmonic Society

High schools

Various countries

• Orange High School (disambiguation), various schools of this name
• Olympic High School (disambiguation), various schools of this name

Canada

• Oromocto High School, in Oromocto, New Brunswick

New Zealand

• Onehunga High School, in Auckland

United Kingdom

• Oriel High School, in Crawley, West Sussex, England
• Oxford High School, in Oxford, Oxfordshire, England

United States

• Oakland High School, in Oakland, California
• Oakmont High School, in Antelope, California
• Oakton High School, in Vienna, Virginia
• Oceanside High School, in Oceanside, California
• Odessa High School (New York), in Odessa, New York
• Odessa High School, in Odessa, Texas
• Odessa High School (Washington), in Odessa, Washington
• Ogden High School (Utah), in Ogden, Utah
• Olympian High School, in San Diego County, California
• Olympic High School, in Charlotte, North Carolina
• Opelika High School, in Opelika, Alabama
• Orem High School, in Orem, Utah
• Orion High School, in Orion, Illinois
• Osborne High School, in Marietta, Georgia
• Ottawa Senior High School, in Ottawa, Kansas
• Ottumwa High School, in Ottumwa, Iowa
• Stanford Online High School, online school based in Redwood City, California
• Oswego High School, in Oswego Illinois
• Oswego High School, in Oswego, New York

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