This book contains the proceedings of the 9th International Conference on Complexity, Future Information Systems and Risk (COMPLEXIS 2024). This year, COMPLEXIS was held in Angers, France, from April 28 - 29, 2024. It was sponsored by the Institute for Systems and Technologies of Information, Control and Communication (INSTICC). COMPLEXIS 2024 was also organized in cooperation with the Centre of Complex Systems IPN and the Centre for Complex Systems Studies. The International Conference on Complexity, Future Information Systems and Risk, is a yearly meeting place for presenting and discussing innovative views on all aspects of Complex Information Systems, in different areas such as Informatics, Telecommunications, Computational Intelligence, Biology, Biomedical Engineering and Social Sciences. Information is pervasive in many areas of human activity – perhaps all – and complexity is a characteristic of current Exabyte-sized, highly connected and hyper dimensional, information systems. COMPLEXIS 2024 received 19 paper submissions from 14 countries of which 32% were accepted and published as full papers. A double-blind paper review was performed for each submission by at least 2 but usually 3 or more members of the International Program Committee, which is composed of established researchers and domain experts. The high quality of the COMPLEXIS 2024 program is enhanced by the keynote lecture delivered by distinguished speakers who are renowned experts in their fields: Luigi Atzori (Università degli Studi di Cagliari, Italy) and Samuel Fosso Wamba (Toulouse Business School, France). All presented papers will be available at the SCITEPRESS Digital Library and will be submitted for evaluation for indexing by SCOPUS, Google Scholar, The DBLP Computer Science Bibliography, Semantic Scholar, Engineering Index and Web of Science / Conference Proceedings Citation Index. As recognition for the best contributions, several awards based on the combined marks of paper reviewing, as assessed by the Program Committee, and the quality of the presentation, as assessed by session chairs at the conference venue, are conferred at the closing session of the conference. A shortlist of papers presented at the conference will be selected for recommended of extended and revised versions in the special issues of the Springer Nature Computer Science Journal, Journal of Global Information Management, IMA Journal of Management Mathematics, Socio-Economic Planning Sciences and Big Data Journal, Big Data Journal and Internet of Things . The program for this conference required the dedicated effort of many people. Firstly, we must thank the authors, whose research efforts are herewith recorded. Next, we thank the members of the Program Committee and the auxiliary reviewers for their diligent and professional reviewing. We would also like to deeply thank the invited speakers for their invaluable contribution and for taking the time to prepare their talks. Finally, a word of appreciation for the hard work of the INSTICC team; organizing a conference of this level is a task that can only be achieved by the collaborative effort of a dedicated and highly capable team. We wish you all an exciting and inspiring conference. We hope to have contributed to the development of our research community, and we look forward to having additional research results presented at the next edition of COMPLEXIS, details of which are available at https://complexis.scitevents.org