It is clear that, under customary international law, the state that has suffered an armed attack must request aid before other states can provide it with that aid in the exercise of collective self-defence. There are a range of factors that need to be considered that do (or, at least, may) have a bearing on the ‘validity’ of that request. This chapter analyses perhaps the most controversial of them: the question of who can issue a collective self-defence request. In so doing, it examines the view that only states can request aid in collective self-defence and, indeed, further asks whether the issuer of the request must be a UN member. The bulk of the chapter then examines how one identifies the de jure government of the state for the specific purpose of issuing a collective self-defence request. A traditional reference point for the recognition of governments in international law generally has been the effective control of territory. However, this is of minimal – if any – importance to the identification of the entity that can request aid in collective self-defence. Instead, other factors, such as democratic and constitutional legitimacy, are of greater importance.