This article aims at reviewing the practice of ‘initiatives’ by Intergovernmental Organizations ( IGO s) when responding to crises or the unforeseen needs of their respective memberships. It forms part of a broader research project on the role of IGO s in international law where more than 100 initiatives were identified so far, focusing on 14 IGO s. The notion of an IGO ’s initiative, conceptualised as activities of the Executive Heads and the secretariat’s staff that enhance the remit of an organization beyond those functions initially or formally envisaged by its constituent instrument, is examined. A descriptive analysis of over 30 initiatives indicate that they may be successful in addressing modern unforeseen challenges, whether they stem from international emergencies, climate change, dynamic technological advancements, or global health crises such as the covid -19 pandemic- especially when such initiatives are accepted and supported by IGO s’ members.