Mental distress in medical learners and its consequent harmful effects on personal and professional functioning, a well-documented concern, draws attention to the need for solutions. The authors review the development of a comprehensive mental health service within a large and complex academic medical education system, created with special attention to offering equitable, accessible, and responsive care to all trainees. From the inception of the service in January 2017, the authors placed particular emphasis on eliminating obstacles to learners’ willingness and ability to access care, including concerns related to cost, session limits, privacy, and flexibility with modality of service delivery. Development of outreach initiatives included psychoeducational programming, consultation services, and cultivation of liaison relationships with faculty and staff. Significant utilization of clinical services occurred in the first year of the program and increased further over the course of 4 academic years (2017–2021); with a 2.2 times increase in trainees served and a 2.4 times increase in visits annually. In the 2020–2021 academic year, 821 medical learners received services (for a total 5,656 visits); 30% of all medical students and 25% of house staff and fellows sought treatment in that year. In 2021, 38% of graduating medical school students and 27% of graduating residents and fellows had used mental health services at some point in their training. Extensive use of services combined with very high patient satisfaction ratings by medical learners within this system demonstrate the perceived value of these services and willingness to pursue mental health care when offered a resource that is cognizant of, and responsive to, their unique needs. The authors reflect on potential factors promoting utilization of services—institutional financial support, outreach efforts, and design of services to increase accessibility and reduce barriers to seeking treatment—and propose future areas for investigation.