This book constitutes the proceedings of the Second International Conference on Big Data Computing and Communications, Big Com 2016, held in Shenyang, China, in July 2016. The 39 papers presented in this volume were carefully reviewed and selected from 90 submissions. Big Com is an international symposium dedicated to addressing the challenges emerging from big data related computing and networking.The conference is targeted to attract researchers and practitioners who are interested in Big Data analytics, management, security and privacy, communication and high performance computing in its broadest sense.