| Abbreviations | Meaning |
 | ODHA | Oregon Dental Hygienists Association |
| ODPHP | Office Of Disease Prevention And Health Promotion |
| ODQ | Ordre Des Dentistes Du Québec |
| ODS | Office Of Dietary Supplements |
| ODST | Online Depression Screening Test |
| OEB / EPO / EPA | Office Européen Des Brevets / European Patent Office / Europäisches Patentamt |
| OECD / OCDE | Organisation For Economic Co-operation And Development / Organisation De Coopération Et De Développement Economiques |
| OECI | Organisation Of European Cancer Institutes |
| OEDT / EMCDDA | Observatoire Européen Des Drogues Et Des Toxicomanies / European Monitoring Centre For Drugs And Drug Addiction |
| OEGGG | Österreichischen Gesellschaft Für Gynäkologie Und Geburtshilfe |
| OEHHA | Office Of Environmental Health Hazard Assessment |
| OEI | Obesity Education Initiative. National Heart, Lung, And Blood Institute. |
| OEM | Occupational And Environmental Medicine [periodical] |
| OER | NIH Office Of Extramural Research |
| OERTC | Organisation Européenne De Recherche Sur Le Traitement Du Cancer |
| OESO | World Organization For Specialized Studies On Diseases Of The Esophagus |
| OFA | Orthopedic Foundation For Animals |
| OFDT | Observatoire Français Des Drogues Et Des Toxicomanies. French Monitoring Centre For Drugs And Drug Addiction |
| OFEDO | Organización De Facultades, Escuelas Y Departamentos De Odontología. Organization Of Faculties, Schools, And Departments Of Dentistry |
| OFP | Office Of Family Planning |
| OFRC | Oklahoma Family Resource Coalition |
| OFSP / BAG / FOPH / UFSP | Office Fédéral De La Santé Publique / Bundesamt Für Gesundheit / Federal Office Of Public Health / Ufficio Federale Della Sanità Pubblica |
| ÖGARI | Österreichische Gesellschaft Für Anaesthesiologie, Reanimation Und Intensivmedizin |
| ÖGDV | Österreichische Gesellschaft Für Dermatologie Und Venerologie. Austrian Society Of Dermatology And Venereology |
| ÖGES | Österreichische Gesellschaft Für Endokrinologie Und Stoffwechsel. Austrian Society Of Endocrinology And Metabolism |
| ÖGIAIM | Österreichische Gesellschaft Für Internistische Und Allgemeine Intensivmedizin |
| OH | Osteopathic Hospitals [periodical] |
| OHA | Ontario Homeopathic Association |
| OHA | Ontario Hospital Association |
| OHA | Oral Health America |
| OHAP | Office Of HIV/AIDS Policy |
| OHASA | Oral Hygienists Association Of South Africa |
| OHCEN | Ontario Health Care Evaluation Network |
| OHDQ | Ordre Des Hygiénistes Dentaires Du Québec |
| OHE | Office Of Health Economics |
| OHF | Oxalosis And Hyperoxaluria Foundation |
| OHIMA | Ohio Health Information Management Association |
| OHLA | Ontario Health Libraries Association |
| OHPCO | Ohio Hospice & Palliative Care Organization |
| OHRE | Office Of Human Radiation Experiments. Department Of Energy |
| OHRP | Office Of Human Research Protection |
| OHSLA | Ohio Health Sciences Library Association |
| OHSR | Office Of Human Subjects Research |
| OI FOUNDATION | Osteogenesis Imperfecta Foundation |
| OIA | Ophthalmic Imaging Association |
| OICS / INCB / JIFE | Organe International De Contrôle Des Stupéfiants / International Narcotics Control Board / Junta Internacional De Fiscalización De Estupefacientes |
| OIE | Office International Des Épizooties. Organisation Mondiale De La Santé Animale. World Organisation For Animal Health. Organización Mundial De Sanidad Animal. |
| OIFE | Osteogenesis Imperfecta Federation Europe |
| OIIO / CNO | Ordre Des Infirmières Et Infirmiers De L'Ontario / College Of Nurses Of Ontario |
| OIIQ | Ordre Des Infirmières Et Infirmiers Du Québec |
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