American Psychological Association: This is the premier American association.
Association for Psychological Science: The Association for Psychological Science (previously the American Psychological Society) is a nonprofit organization dedicated to the advancement of scientific psychology and its representation at the national and international level.
Association for Research in Personality: The Association for Research in Personality is a scientific organization devoted to bringing together scholars whose research contributes to the understanding of personality structure, development, and dynamics.
International Association of Applied Psychology: The International Association of Applied Psychology is the oldest international association of psychologists. Its official languages are English and French.
Society for the Psychological Study of Social Issues: Founded in 1936, SPSSI is a group of over 3000 scientists from psychology and related fields and others who share a common interest in research on the psychological aspects of important social and policy issues.