Lesbian, gay, bisexual, transgender, queer/questioning and other sexual and gender diverse (LGBTQ+) persons frequently lack access to mental health service organizations (MHOs) and therapists who are competent with LGBTQ+ clients. Existing continuing education programmes to better equip therapists to work with LGBTQ+ clients are often not widely accessible or skills focused, evaluated for effectiveness and inclusive of MHO administrators who can address the organizational climate needed for therapist effectiveness. A virtual, face-to-face, multi-level (administrators and therapists) and multi-strategy (technical assistance, workshop and clinical consultations) LGBTQ+ cultural competence training—the Sexual and Gender Diversity Learning Community (SGDLC)—was tested in a pilot randomized controlled trial.