This book constitutes the thoroughly refereed post conference proceedings of the 4th International Conference on Cloud Computing, Cloud Comp 2013, held in Wuhan, China, in October 2013. The 28 revised full papers were carefully reviewed and selected from numerous submissions and cover topics such as mobile cloud computing, services, applications, IoT on cloud, architectures and big data, cloud-assisted pervasive computing and services, management and virtualization for cloud, cloud security.