| Abbreviation | Definition |
|---|---|
| OCD | Obsessive Compulsive Disorder |
| OCF | OsteoChondral Fracture |
| OCFP | Ontario College of Family Physicians |
| OCG | Oral CholecystoGram |
| OCP | Oral Contraceptive Pill |
| OCPD | Obsessive Compulsive Personality Disorder |
| OCPS | Ontario College of Physicians and Surgeons |
| OCSI | Os Calcis Stiffness Index |
| OCSP | Obsessive Compulsive Service Processor |
| OD | Occupational Disease |
| OD | Oculus Dexter (Right Eye) |
| OD | Order Disorder |
| OD | Osteochondritis dissecans |
| OD | Ostrich Disorder |
| OD | OverDose |
| OD | Oxygen Demand |
| ODA | Overview, Diagnosis, Analysis |
| ODC | Oxygen Deficient Center |
| ODD | Observation Danger And Diagnosis |
| ODD | Oppisitional Defiant Disorder |