Research in multimedia computing is generally concerned with presentation, integration and computation of one or more media, such as text, image, graphics, audio, video, social data, and data collected from various sensors, etc., using computing techniques. The 20th IEEE International Symposium on Multimedia is the flagship conference of IEEE Technical Committee on Multimedia and an international forum for researchers to exchange information regarding advances in the state of the art and practice of multimedia computing, as well as to identify the emerging research topics and define the future of multimedia computing. The technical program of ISM2018 will consist of invited talks, paper presentations, and panel discussions. Submissions are solicited for full papers and workshop papers.