This article explores the complex relationship between organisational change and historical dialogue in transitional societies. Using the policing reform process in Northern Ireland as an example, the article does three things: the first is to explore the ways in which policing changes were understood within the policing organisation and ‘community’ itself. The second is to make use of a processual approach, privileging the interactions of context, process and time within the analysis. Third, it considers this perspective through the relatively new lens of ‘historical dialogue’, understood here as a conversation and an oscillation between the past, present and future through reflections on individual and collective memories. Through this analysis, we consider how members’ understandings of a difficult past (and their roles in it) facilitated and/or impeded the organisations change process. Drawing on a range of interviews with previous and current members of the organisation, this article sheds new light on how institutions deal with and understand the past as they experience organisational change within a wider societal transition from conflict to nonviolence.