The proceedings compile rigorously peer-reviewed papers presented at the 4th International Conference on Sensing, Measurement, Communication and Internet of Things Technologies (SMC-IoT 2025), held from November 28-30, 2025. Showcasing cutting-edge advancements across interdisciplinary domains, the proceedings feature original research, innovative applications, and technical breakthroughs in emerging sensing technologies, precision measurement methodologies, next-generation communication architectures, and IoT systems integration. This volume, specifically designed for researchers and engineers, serves as a catalyst for knowledge sharing, collaborative problem-solving, and cross-sector innovation. In addition to supporting curriculum development in IoT-related disciplines, it provides industry professionals with actionable strategies to navigate technological transformation in an era of ubiquitous connectivity.