Knowledge as a Service (KaaS) is one of the forefront of interdisciplinary subjects. KaaS is the integration of knowledge and services in which knowledge serves as a resource to be provided for consumers, so as to achieve the purposes of knowledge exchanging, knowledge sharing and task-based collaboration and problem solving. In recent years, with the rapid development of knowledge discovery, knowledge management, web service, service computing and cloud computing, as well as the growing demand for knowledge service, knowledge service becomes an important research direction emerging rapidly at home and abroad. The KaaS workshop focuses on the key issues in KaaS. Theoretical advances, algorithm and systems, as well as application cases are welcome contributions. The workshop will take into consideration also relevant work-in-progress papers.