The IEEE International Symposium on Circuits and Systems (ISCAS) is the world’s premier networking forum for leading researchers in the highly active fields of theory, design and implementation of circuits and systems. ISCAS 2015, sponsored by the IEEE Circuits and Systems Society and supported by Instituto Superior Técnico and INESC-ID of Universidade de Lisboa and by the Faculty of Sciences and Technology and CTS/UNINOVA of Universidade Nova de Lisboa, will be held in Lisbon, Portugal, from May 24 to 27, 2015. ISCAS 2015 will have a special focus on Enabling Technologies for Societal Challenges, and seeks to address multidisciplinary challenges in circuits and systems using microelectronics, nanotechnologies, biotechnologies and signal processing to address health, demographic change, wellbeing, security and sustainability issues.