What role can diasporas play in advancing peace? How can mediators work with diaspora groups to ensure that they contribute positively to the resolution of conflict? This paper examines, from a mediation practitioner’s perspective, the roles that diasporas can play as catalysts for dialogue in peace processes. Using insights from two case studies – Laos and Papua (Indonesia) – he takes a look at the current debate around the role of diasporas in conflict resolution and draws on lessons learnt from Laos and Papua to suggest ways in which peacemakers can constructively engage diaspora communities.