Urban Transitions 2018 aims to promote healthy urban development by bringing together different disciplines working within cities. Meet world leading experts on urban and transport planning, environmental exposures, physical activity, and public health and governance to discuss current challenges and solutions. Cities suffer from many public health and environmental problems. Poor urban and transport planning is part of the problem but can also be part of the solution. There is great potential for improvement through targeted and integrated policies. However, the urban environment is a complex interlinked system. Decision-makers need enhanced understanding of the linkages involved, cities need better knowledge, and multi-sectorial approaches are needed to tackle the current problems. Urban Transitions 2018 will provide some of the answers.