Partnerships between water, sanitation and hygiene (WASH) and rights-holder organisations (RHOs) have become more common, important and impactful in the international development sector, and they have been driven by aligned agendas, mutual benefits and the pursuit of locally owned and inclusive development agendas. There are opportunities to broaden partnerships and coalitions to include climate change advocacy, adaptation and mitigation organisations given the increased focus on the links between WASH, resilience and climate change action. This article takes a first step in addressing the question: How can the experience of WASH, gender equality and climate organisation partnerships and coalitions in the Blue Pacific inform the WASH sector in its growing support of and investment in diverse partnerships in support of localism? We conducted a systematic scoping review to identify the literature on gender equality, WASH and climate change-related partnerships and coalitions in the Blue Pacific. Three key themes emerged from the systematic scoping review based on 23 studies published from 1996 to 2024. Firstly, partnerships and coalitions are part of a critical localism agenda, though care needs to be taken by potential partners and donors to understand and manage power dynamics between actors and organisations working within and across sectors. Secondly, a range of benefits and success factors have been documented on partnerships and coalitions in the Blue Pacific, including support for emerging leadership, leveraging policy outcomes, facilitating learning and the sharing of frameworks and tools between partners. Thirdly, like all parts of the community and governance ecosystem, gender dynamics and social norms inform and influence partnerships and coalitions. At the same time, partnerships are important for informing and driving gender equality and inclusion at the local and regional levels including within the WASH sector. This article is useful for local actors, donors and civil society organisations wishing to pursue the mutually beneficial goals of WASH, gender equality, climate change action and localisation in the Blue Pacific.