The inclusion of non-state actors such as civil society, businesses, and research institutes as well as the establishment of partnerships as implementation mechanisms have become an integral part of global governance and intergovernmental diplomacy for sustainable development. This chapter assesses in how far the 2030 Agenda and the Sustainable Development Goals have held their promises for introducing innovative reforms in global diplomatic practices related to multi-stakeholderism, by making it more inclusive, integrative, and accountable. A mixed picture emerges, which is exacerbated by the COVID-19 pandemic and the Russian invasion of Ukraine. This chapter also discusses the voluminous literature about multi-stakeholderism, and offers recommendations on strengthening the role of diplomats and international bureaucrats, and for making the UN system more fit for this purpose. Global diplomacy has a crucial role to play in leveraging innovative forms of multi-stakeholderism, and substantive shifts are needed.