The 23nd International Symposium on Multimedia Network Systems and Applications (MNSA-2021) will be held in conjunction with the 16th International Conference on Broadband, Wireless Computing, Communication and Applications (BWCCA-2021) in October 28-30, Fukuoka Institute of Technology (FIT), Fukuoka, Japan Networks of today are going through rapid evolution. In the last few years, we have observed an explosive growth of multimedia computing, multimedia networking and applications. Multimedia technologies have broaden software applications. With the growing popularity of wired and wireless Internet, multimedia network systems and applications are changing our daily life and social activity. Also, the development of useful and attractive applications, such as Multimedia Web Service, Collaborative Systems, Virtual Reality, and Virtual Community Tools is becoming very important. The symposium provides an international forum for researcher and participants to share and exchange their experiences, discuss challenges and present original ideas in all aspects of multimedia systems. We welcome research papers which deal with multimedia applications, middleware for constructing multimedia applications, information networking, commercial systems and tools. The MNSA-2021 International Workshop seeks original contributions in all relevant areas, including but not limited　 to the following topics. Papers of high quality in the following areas will be invited: TOPICS: Multimedia Tool and Systems Social Networking Security, Privacy and Trust Distributed Multimedia Systems and Shared Applications Quality of Service Issues for Multimedia Applications Advanced Internet Technologies and Applications Web Service Tools and Systems Content-based Multimedia Information Retrieval Tools Multimedia Right Protection and Watermarking Wireless Networks and Mobile Multimedia Applications Agent Oriented Multimedia Systems and Applications Mobile Agents and Applications Computer Graphics and Virtual Reality Visual Languages and Visual Programming Distance Learning and Virtual Community E-Commerce and Related Applications Web-meeting Systems Multimedia Networking Applications of Video Coding and Streaming Applications of Image Processing Embedded Systems for Multimedia Applications Mobile Multimedia Digital ecosystems IMPORTANT DATES Paper Submission Deadline : July 31, 2021 Author Notification : August 6, 2021 Author Registration : August 20, 2021 Final Manuscript Due : August 20, 2021 Workshop Dates : October 28-30, 2021 PAPER SUBMISSION GUIDELINE Authors should submit a paper to the MNSA Workshop with maximum 10 pages in length, including all figures, tables, and references. However, authors can add up to 2 extra pages with the appropriate fee payment. Papers must be prepared using the Lecture Notes Style of Springer Proceedings (download from HERE (BWCCA-2021 web site) source files), and must be formatted in PDF format. Prepare your paper in PDF file and submit it electronically to the BWCCA-2020 submission web page: https://edas.info/N28018 Please select the track: "Workshop-MNSA-2021: The 23-nd International Symposium on Multimedia Network Systems and Applications (MNSA-2021)". All accepted papers will be included in the conference proceedings of Lecture Notes in Data Engineering and Communication Technologies series published by Springer. Proceedings will be sent by Springer for indexing in EI and SCOPUS. Accepted papers will be given guidelines in preparing and submitting the final manuscript(s) together with the notification of acceptance. Authors of accepted papers, or at least one of them, are requested to register and present their work at the workshop, otherwise their papers will be removed from the digital library after the conference. Please do follow the announcement on the BWCCA-2021 website. Workshop Organizers: Tomoya Enokido, Rissho University, Japan Leonard Barolli, Fukuoka Institute of Technology (FIT), Japan