| Abbreviation | Definition |
|---|---|
| OCL | Obsessive Compulsive Lying |
| OCMD | Office Of Communication Management And Development |
| OCS | Only Child Syndrome |
| ODD | Oppositional Defiant Disorder |
| ODIP | Office on Disability Issues in Psychology |
| OEO | Office Of Economic Opportunity |
| OFS | Orbito-Frontal Syndrome |
| OIQ | Occupationally Important Qualities |
| OLRT | Occupational List Recall Test |
| OPI | Other Peoples' Interviews |
| OPP | Ordem dos Psicólogos Portugueses |
| OPP | Oxford Psychology Press |
| OR | Orienting Response |
| ORPC | Online Readings in Psychology and Culture |
| OSAB | Observation Scale for Aggressive Behavior |
| OTP | Oneness Trust Passion |
| PA | Panic Attack |
| PACE | Psychology of Abilities, Competencies, and Expertise |
| PADDS | Pediatric Attention Deficit Disorders Screener |
| PAI | Psychological Assessment Inventory |