Big Data promises to reshape tomorrow's knowledge, society and economy. The technologies that are used to generate, collect, process, compute and communicate Big Data have made significant progresses in the past few years. Such a disruptive technology inevitably poses a number of significant challenges on the underlying system design. The International Conference on Big Data Computing and Communications (BIGCOM2019), which is to be held on August 9-11, QingDao, China, aims to address these challenges. 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. We welcome original, unpublished research papers that emphasize theoretical foundations, modeling, algorithmic methodologies, and data-driven applications. We also welcome visionary papers on new and emerging topics. The related topics include but not limited to the following: