GCRF Urban Disaster Risk Hub The Hub will reduce disaster risk for the poor in tomorrow's cities. The failure to integrate disaster risk resilience into urban planning and decision-making is a persistent intractable challenge that condemns hundreds of millions of the World's poor to continued cyclical destruction of their lives and livelihoods. It presents a major barrier to the delivery of the Sustainable Development Goals in expanding urban systems. Science and technology can help, but only against complex multi-hazard context of urban life and the social and cultural background to decision-making in developing countries. Science-informed urbanisation, co-produced and properly integrated with decision support for city authorities, offers the possibility of risk-sensitive development for millions of the global poor. This is a major opportunity - some 60% of the area expected to be urban by 2030 is yet to be built. Our aim is to catalyse a transition from crisis management to risk-informed planning in four partner cities and globally through collaborating International governance organisations.  The Hub, co-designed with local and international stakeholders from the start, will deliver this agenda through integrated research across four urban systems - Istanbul, Kathmandu, Nairobi and Quito - chosen for their multi-hazard exposure, and variety of urban form, development status and governance. Trusted core partnerships from previous Global Challenge Research Fund, Newton Fund and UK Research Council projects provide solid foundations on which city based research projects have been built around identified, existing, policy interventions to provide research solutions to specific current development problems. We have developed innovative, strategic research and impact funds and capable management processes constantly to monitor progress and to reinforce successful research directions and impact pathways. In each urban system, the Hub will reduce risk for 1-4 million people by (1) Co-producing forensic examinations of risk root causes, drivers of vulnerability and trend analysis of decision-making culture for key, historic multi-hazard events. (2) Combining quantitative, multi-hazard intensity, exposure and vulnerability analysis using advances in earth observation, citizen science, low cost sensors and high-resolution surveys with institutional and power analysis to allow multi-hazard risk assessment to interface with urban planning culture and engineering. (3) Convene diverse stakeholder groups-communities, schools, municipalities private enterprise, national agencies- around new understanding of multi-hazard urban disaster risk stimulating engagement and innovation in making risk-sensitive development choices to help meet the SDGs and Sendai Framework.  Impact will occur both within and beyond the life of the Hub and will raise the visibility of cities in global risk analysis and policy making. City Partnerships, integrating city authorities, researchers, community leaders and the private sector, will develop and own initiatives including high-resolution validated models of multi-hazard risk to reflect individual experience and inform urban development planning, tools and methods for monitoring, evaluation and audit of disaster risk, and recommendations for planning policy to mitigate risks in future development. City partnerships will collaborate with national and regional city networks, policy champions and UN agencies using research outputs to structure city and community plans responding to the Sendai Framework and targeted SDG indicators, and build methods and capacity for reporting and wider critique of the SDG and Sendai reporting process. Legacy will be enabled through the ownership of risk assessment and resilience building tools by city and international partners who will identify need, own, modify and deploy tools beyond the life of the Hub. The Global Challenges Research Fund (GCRF) supports cutting-edge research to address challenges faced by developing countries. The fund addresses the UN sustainable development goals. It aims to maximise the impact of research and innovation to improve lives and opportunity in the developing world.