Mindfulness is increasingly being used within leadership development to enhance managers' wellbeing and leadership capability. Given the relational nature of leadership, we posit that an interpersonal form of mindfulness has the potential to offer benefits over and above those provided by personal or internal mindfulness. We therefore chose a Delphi research methodology to consult and achieve consensus among expert practitioners, exploring if and how interpersonal mindfulness, in the specific form of the Interpersonal Mindfulness Program (IMP), can contribute to leadership development. Our aims were, firstly, to identify the necessary components of an IMP-based leadership development program and, secondly, to create guidelines for practitioners. Through four phases of data-gathering and feedback, we achieved consensus among 39 experts on guidelines for how to develop a leadership development program based on the IMP, contextual factors that will act as facilitators or barriers, and selection and screening of participants. The intention is that the resulting guidelines will support the implementation of coherent, consistent IMP-based leadership development, sensitive both to its origins and to the context.