Alliance of Small Island States (AOSIS) is a coalition of 44 small island and low-lying coastal developing states, including five observers. As a voice for the vulnerable, its mandate is more than amplifying marginalised voices as it also advocates for these countries’ interests. In terms of size, AOSIS closely resembles the countries it represents on the global stage, but often punches far above its weight, negotiating historic global commitments to cut greenhouse gas emissions, among other achievements.To achieve its goals, AOSIS often draws on partnerships, including with the United Nations Development Programme (UNDP) and the European Commission, to bolster its capacity to effectively influence climate negotiations, some of the most complex and difficult in the world. AOSIS also makes vital contributions by helping its members to pool their resources and amplify their collective voice in climate talks. This goes beyond just speaking up to securing ambitious agreements with tangible benefits for vulnerable communities.