Psychotherapies, such as Interpersonal Psychotherapy (IPT), that have proven effective for treating mental disorders mostly lie dormant in consensus-treatment guidelines. Broadly disseminating these psychotherapies by training trainers and front-line health workers could close the gap between mental health needs and access to care. Research in continuing medical education and knowledge translation can inform the design of educational interventions to build capacity for providing psychotherapy to those who need it. This paper summarizes psychotherapy training recommendations that: adapt treatments to cultural and health organizational contexts; consider implementation barriers, including opportunity costs and mental health stigma; and engage local opinion leaders to use longitudinal, interactive, case-based teaching with reflection, skills-coaching, simulations, auditing and feedback. Community-based training projects in Northern Ontario, Canada and Ethiopia illustrate how best-education practices can be implemented to disseminate evidence-supported psychotherapies, such as IPT, to expand the therapeutic repertoire of health care workers and improve their patients' clinical outcomes.