Access to higher education remains elusive for many young people despite substantial investment in outreach interventions, most of which target students in underrepresented equity groups. This paper explores an alternative approach to widening participation in Australia that focuses on teacher professional development to support student aspirations. We examine school teachers' responses to a course designed to develop their conceptual understanding of aspirations and provide a framework for developing aspirations-related initiatives with their students and colleagues. The course pilot was evaluated drawing on surveys (N = 49) and interviews (N = 21). Teachers reported that they gained the following: (1) access to robust evidence of factors affecting aspirations; (2) relevant theoretical perspectives to conceptualise aspirations in new ways; and (3) insights on practical strategies with which they might nurture student pathways to higher education. To support widening participation in higher education, we argue that the scope of current outreach initiatives offered by universities must broaden to capitalise on the untapped potential of teachers.