Mentoring and coaching are primarily intended to develop "mentees," net of any benefits for mentors. This paper details the construction of a mentor-coaching model to develop leadership capability in Higher Education Academy Fellowship program mentors at an Australian university. We elaborate developmental benefits for mentors of an iterative approach, in which mentee experiences inform subsequent mentor training and help to build community. This serves the key aims of our program, including anticipated benefits for the institution flowing from this strategy for driving broader change in learning and teaching cultures and practices. We propose that dyadic and group mentoring can be structured to support growth in leadership capability in a community of mentors, if participation in that community is framed as a form of continuing professional learning. We detail the program level mechanisms through which this capability building model of mentor-coaching may potentially transform learning and teaching at Deakin University.