This book contains the proceedings of the 10th International Conference on Internet of Things, Big Data and Security. This year, IoTBDS is held in Porto, Portugal, on April 6-8, 2025. It was sponsored by the Institute for Systems and Technologies of Information, Control and Communication (INSTICC). The Internet of Things (IoT) is a platform that allows a network of devices (sensors, smart meters, etc.) to communicate, analyse data, and process information collaboratively in the service of individuals or organisations. The IoT network can generate large amounts of data in a variety of formats and use different protocols that can be stored and processed in the cloud. The conference looks to address the issues surrounding IoT devices, their interconnectedness and the services they may offer, including efficient, effective and secure analysis of IoT-generated data using machine learning and other advanced techniques, models and tools, and issues of security, privacy and trust that will emerge as IoT technologies mature and become part of our everyday lives.Big Data (BD) has core values of volume, velocity, variety and veracity. After collecting much data from IoT, BD can be jointly used with machine learning, AI, statistical and other advanced techniques, models and methods, which can create values for people and organisations adopting it, since forecasting, deep analysis and analytics can help identify weaknesses and make improvements based on different analysis. Maintaining a high level of security and privacy for data in IoT is crucial, and we welcome recommendations, solutions, demonstrations, and best practices for all forms of security and privacy for IoT and BD. IoTBDS 2025 received 73 paper submissions from 27 countries, of which 21.92% 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 IoTBDS 2025 program is enhanced by the keynote lectures delivered by distinguished speakers who are renowned experts in their fields: Ana Aguiar (Faculty of Engineering University of Porto/ Instituto de Telecomunicações, Portugal), Schahram Dustdar (Vienna University of Technology, Austria) and Loic Bachelart (Microsoft, France). The conference is complemented by a Special Session on Artificial Intelligence for Emerging IoT Systems: Open Challenges and Novel Perspectives, chaired by Fiammetta Marulli and Lelio Campanile. 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. 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 conference's closing session as recognition for the best contributions. The program for this conference required the dedicated effort of many people. Firstly, we must thank the authors, whose research efforts are reported here. 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; organising a conference of this level is a task that can only be achieved by the collaborative effort of a dedicated and highly competent 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 IoTBDS, details of which are available at https://iotbds.scitevents.org