Developing leadership among early childhood professionals has become increasingly important as investing in children's early years has been championed as a public and private national and international priority. Two case studies present how oral inquiry and specifically, the Prospect Center's Descriptive Review of a Professional Dilemma of Practice, was used to support early childhood professionals to develop their leadership by strengthening the skills and dispositions they need to critically reflect upon, explore and negotiate the complex dilemmas they face in the context of their daily practice. Research on the use of inquiry to address uncertainty, the development of reflective practices, relational logics of effectiveness and social justice leadership inform discussion of the findings. Implications suggest the promise of using oral inquiry to support leadership development for early childhood professionals. (author abstract)