The present paper highlights key issues confronting Asian coastal megacities in planning for future climate change. Critical gaps in information/knowledge for carrying out risk and vulnerability assessments to support urban development planning were highlighted at an APN and Ibaraki University-sponsored workshop by expert teams representing Bangkok, Ho Chi Minh City, Jakarta, Manila and Mumbai. The workshop – Climate Change Vulnerability Assessment and Urban Development Planning for Asian Coastal Cities – held from 22-28 August 2010 in Nakhon Pathom, Thailand, brought together over 40 participants including academics, urban planners and officials, and experts in disaster management. The workshop identified current information/knowledge gaps and challenges, and identified future research opportunities. Key findings distilled from the workshop were grouped into three categories – ‘assessment of climate change related risk,’ ‘information/knowledge management,’ and ‘governance.’ Across these themes, some 25 specific observations and recommendations for future research were identified. It is anticipated that key findings from this workshop will shape the future research agenda in these cities. Some of the key findings and research recommendations included the following: Risk assessments were hampered by inadequate information, ranging from the lack of baseline climate data to the need for developing indicators for determining socio-economic vulnerabilities; food and water security and health assessments demanded greater attention; access and dissemination of information was limited, with development of online information/ knowledge management systems deficient; future capacity building activities proposed included developing an integrated course on urban development and climate change; and, a spectrum of governance-related matters were raised including issues of institutional coordination, deficiencies in existing city plans, development of building codes, vulnerability of the poor, and challenges of funding.