| Abbreviation | Definition |
|---|---|
| IDEP | Individual Differences and Evolutionary Psychology |
| IDP | Integrative Depth Psychotherapy |
| IED | Intermittent Explosive Disorder |
| IF | Imaginary Friend |
| IGCP | Institute for Graduate Clinical Psychology |
| IGPA | International Golf Psychology Association |
| IIS | Images and Identity Survey |
| IIS | Induced Is Shared |
| IJCP | International Journal of Comparative Psychology |
| IJCP | Iranian Journal of Clinical Psychology |
| IJP | International Journal of Psychology |
| IME | Important Mind Emanations |
| INTP | Introverted Intuitive Thinking Perceiver |
| IOD | Internet Obsessional Disorder |
| IODQ | Internet Obsession Diagnostic Questionnaire |
| IOP | Industrial Organizational Psychology |
| IPAP | International Psychopharmacology Algorithm Project |
| IPC | Innovative Psychological Consultants |
| IPCD | International Psychology Conference Dubai |
| IPCP | International Project on Competence in Psychology |