This book gathers outstanding research papers presented at the 9th International Joint Conference on Advances in Computational Intelligence (IJCACI 2025), held in hybrid mode at Washington University of Science and Technology (WUST), Alexandria, United States, and RV Institute of Management (RVIM), Bangalore, India, during August 23–24, 2025. The book presents original contributions in areas of computational intelligence, and it serves as a reference material for advanced research. The topics covered are collective intelligence, soft computing, optimization, cloud computing, machine learning, intelligent software, robotics, data science, data security, big data analytics, and signal and natural language processing.