I
- Institute of Professional Psychologists
- International Association for Cross-Cultural Psychology
- International Association of Applied Psychology
- International Council of Psychologists
- International Early Psychosis Association
- International Literature and Psychology Conference
- International Psychoanalytic Association
- International School Psychology Association
- International Society for Comparative Psychology
- International Society for the Study of Behavioural Development
- International Society for the Study of Individual Differences
- International Society for Intelligence Research
- International Society for Research on Aggression
- International Society of Political Psychology
- International Transpersonal Association
- International Union of Psychological Science
- International Institute for the Advanced Studies of Psychotherapy and Applied Mental Health
Read more about this topic: List Of Psychology Organizations