This entry summarizes key concepts and empirical research findings to date on how psychology educators and trainers can facilitate understanding of gender-related influences in effective psychology practice. The pervasive and often unrecognized influences of sexism, heterosexism, and cisgenderism in educational, supervisory, and therapeutic dynamics are highlighted at individual, interpersonal, and systemic levels. As an element of the broader multicultural training of psychologists and other mental health professionals, gender competencies development requires continual and conscious analyses of the influences of cultural contexts as well as how gender identities intersect with one’s other identities of privilege and oppression.