Although there is ongoing debate about the causal mechanisms linking climate change to violent conflict, researchers and policymakers widely agree that climate change exacerbates existing vulnerabilities that undermine human security and societies´ well-being. Resource scarcity and natural disasters can lead to increased cooperation, but the double burden of climate change and political fragility constitutes a serious challenge and the most detrimental effects are seen in already fragile contexts. Due to the importance of preventive measures, development organizations are key in addressing and mitigating the combined challenges of climate and conflict. Such organizations are conceptualizing and integrating security risks posed by climate change, but previous research shows that this work is hampered by organizational silos. This paper contributes to the burgeoning research on integrated approaches to addressing combined challenges of climate and conflict by organizations through examining how the Swedish International Development Cooperation Agency (Sida) works with these issues. In 2015, Sida received an updated directive increasing ambitions for the integration of the thematic issue areas of environment and climate, conflict and gender. The paper uses a comprehensive understanding of security and applies insights on mainstreaming in official development assistance (ODA) from environmental policy integration literature to examine how the connections between climate and security are framed in central policies, in strategies and by Sida staff. It also analyzes how Sida’s organization and procedures support the integration of the two perspectives ‘environment and climate’ and ‘conflict’ and highlights challenges and opportunities that arise when translating policy and strategy into practice. The study is based on an analysis of overarching instructions, policy documents and interviews with 24 Sida staff at Sida’s headquarters in Stockholm and at Swedish Embassies in Eastern Africa. The experience of Sida is an illustrative example of an emerging challenge for ODA actors, and can therefore be valuable for a broad set of organizations also aiming to develop integrated approaches. The study shows that although Sida prioritizes the integration between environment and climate, and conflict on a general policy level, there are some challenges when translating the policy into practice. Ambiguities are identified with regard to concepts used and there are tensions between expert and general knowledge. There are many initiatives aiming to integrate climate and conflict with one another, but increased collaboration on operationalization could enable even deeper levels of integrated work.