Given the fast pace of global socio-economic development, more tailored, focused, and localised efforts to strengthen public sector capacity in small island developing states (SIDS) is increasingly important. SIDS have unique vulnerabilities, rich histories and contexts, and strengths that can be harnessed for sustainable development. Development partners need to adapt how they provide capacity-strengthening support, taking individual SIDS’ circumstances and needs into account to better help them achieve their ambitions. This report summarises perspectives from small island developing states (SIDS) on current experiences and opportunities to improve capacity-strengthening support to make it more tailored, impactful, and sustainable. The report uses the broad definition of capacity-strengthening as activities that improve the competencies and abilities of individuals, organisations, and broader formal and informal social structures in a way that boosts organisational performance. It concentrates on public sector capacity, including interactions with other stakeholders across sectors.