This chapter describes the study of interpreting in humanitarian frontline negotiation. The overall purpose of humanitarian negotiation is to ensure the impartial protection of civilians who are affected by armed conflicts, and the provision of assistance to them, as stipulated by international humanitarian law (IHL), human rights law and refugee law. In this context, gaining access to the conflict zone is one of the most challenging aspects of the negotiations. These negotiations take place between the negotiator (who works for a humanitarian organisation) and the local authorities, who do not always speak the same language or share the same culture. Therefore, the role of the interpreter is essential to overcome these linguistic and cultural barriers. Drawing on the findings of a participatory community research project carried out with the Centre of Competence on Humanitarian Negotiation (CCHN), this chapter presents an overview of interpreting and the role of interpreters in humanitarian negotiation. It endeavours to delve deeper into the particularities of interpreting in humanitarian negotiation, the interpreter’s positionality, and the need to design specific training activities that take into account the characteristics of these missions.