The increasing urbanization and rising need for sustainable development demand effective urban planning, infrastructure development and upgrades. This is a difficult problem due to fiscal limitations and dynamic nature of cities. A novel approach to address this issue is through urban informatics, which uses urban-related data, with aids from mathematical tools and computer science, to better understand urban systems and make economic decisions. Recognizing the importance of urban informatics, an immediate question to ask is how to discover, organize and make openly available urban datasets, which would remain hidden in the nooks and crannies of the Internet. With the research problem in mind, we propose the Global Urban Data Repository (GUDR), a crowd-sourced open repository of urban data build on the standards of the Semantic Web.