The recent global diffusion of newtechnologies, combined with the use of big data analytics,can help policymakers promote the effective development offuture cities that provide living and work environments inwhich citizens can thrive. In particular, innovativeapplications of geospatial and sensing technologies and thepenetration of mobile phone technology are providingunprecedented data collection This data can be analyzed formany purposes, including tracking population and mobility,private sector investment, and transparency in federal andlocal government. To help development practitioners withinand beyond the World Bank take advantage of these trends,this brief profiles a sample of big data applications tosupport improved urban development in low- and middle-incomecountries. It also cites potential opportunities for bigdata analytics to help developing nations achievesustainable urban growth, while reducing the economicdifferential with high-income countries.