| National Asthma Educator Certification Board | National Asthma Survey | National Astronomical Observatories, Chinese Academy of Sciences | National Astronomical Observatory | National Astronomical Observatory of Japan |
| National Astronomical Research Institute of Thailand | National Astronomy and Astrophysics Advisory Committee | National Astronomy and Ionosphere Center | National Astrophysics and Space Science Programme | National Asylum Support Service |
| National Asylum Workers' Union | National Ataxia Foundation | National Athletic Association | National Athletic Association of Schools, Colleges and Universities | National Athletic Equipment Reconditioner's Association |
| National Athletic Health Institute | National Athletic Injury/Illness Reporting System | National Athletic Testing Program | National Athletic Trainers' Association | National Athletic Trainers' Association Board of Certification |
| Occidental Power Services Inc. | Occidental Type Cerebro-Muscular Dystrophy | OCCIE | OCCIG | OCCIO |
| Occipital Acoustic Window | Occipital Frontal Diameter | Occipital Horn Syndrome | Occipital horn syndrome | Occipitalis Muscle |
| Occipital Nerve Block | Occipital Nerve Stimulation | occipito-iliaque gauche antérieure | Occiput Anterior | Occiput Posterior |
| OCCIS | OCCJ | OCCJE | OCCK | OCCL |
| Occluded Eye Gunsight | occluded front | Occluded Frontal Passage | Occluded Left Gastric Venous Pressure | Occluded Particulate Organic Matter |
| Occluded-to-Normal | Occlusal Plane and Sella Nasion | Occlusal Surface to the Alveolar Crest | Occlusal Surface to the Gingival Margin | occlusal vertical dimension |
| Occlusion | occlusion | Occlusion Culling Unit | Occlusion-Derived Virus | Occlusion Pressure Response to Hypercapnia |
| Occlusive Disease of the Aortic Bifurcation | Occlusive Disease of the Peripheral Arteries | Occlusive Peripheral Arterial Disease | Occlusive Retinal Vascular Disorders | OCCM |
| OCCMED | OCC MED | OCCMHA | OCCMS | OCCMSI |
| OCCN | OCCNA | OCCO | OCCOA | OCCOG |
| OCCOPPQ | OCCOPS | Occoquan Watershed Monitoring Laboratory | Occoquan Watershed Monitoring Program | OCCP |
| OCC-P | OCCPEHR | OCCPL | OCCPS | OCCQ |
| OCC-R | OCCR | OCCRA | OCCRL | OCCRP |
| OCCRRA | OCCRRN | OCCS | OCCSA | OCCSB |
| OCCSD | OCCSS | OCCSSA | OCCT | OCCTA |
| OCCTC | OCCTF | OCC-TI | OCC-TI-AS | OCC-TI-CS |
| OCC-TI-WAIT | OCCTL | OCCTO | OCCU | OCCULT |
| Occult and Paranormal House of Investigational Research | Occultation Measurement | Occultation Newsletter | Occult Blood | occult blood |
| Occult Chronic Kidney Disease | Occult Control Coordination Unit Liaison, Unconventional Situations | Occult Ectopic ACTH | Occult Ectopic ACTH (Adrenocorticotropic Hormone) Syndrome | occulting |
| Occult Malignant Primary | Occult New Vessels | Occult Papillary Thyroid Cancer | Occult Primary Breast Cancer | Occult Tight Filum Terminale |
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