Every five years the UN undertakes a review of the Peacebuilding Architecture (PBA) to assess the system’s progress towards peacebuilding and sustaining peace as well as to outline priority areas for the coming years. QUNO, drawing upon its long-standing history of exploring the topic of reconciliation in peacebuilding, submitted a thematic paper, Building Peace through Reconciliation, to contribute to the 2020 PBA review. The document focuses on three key areas, namely: the definitional challenges of reconciliation; reconciliation and the Peacebuilding Architecture; and key messages on reconciliation.