The 9th International Conference “Big Data, Knowledge and Control Systems Engineering” (BdKCSE’2025) aims to provide an open forum for the dissemination of current research progress, innovative approaches, and original research results on all aspects of Big Data Management, Technologies, and Applications. The organizer of the BdKCSE’2025 Conference is the John Atanasoff Society of Automatics and Informatics, with co-organizers the Institute of Information and Communication Technologies of the Bulgarian Academy of Sciences, the Federation of the Scientific Unions in Bulgaria, the Bulgarian Association of Intelligent Systems, and Trakia University – Stara Zagora. Big Data Management, Technologies, and Applications discuss the exponential growth of information size and the innovative methods for data capture, storage, sharing, and analysis. Modern technologies continue to become more complex, as do the applications.

International Conference on Big Data, Knowledge and Control Systems Engineering (BdKCSE) is technically sponsored by IEEE. The proceedings of the conference will be submitted for inclusion in prestigious databases such as Scopus, Web of Science (WoS), Ei Compendex, DBLP, Google Scholar, and many others.