The book consists of peer reviewed and presented papers of the 3rd International Conference on Cloud Computing and Computer Network (CCCN 2025), which took place in Singapore during May 16-18, 2025. The conference is held annually to gather scholars, researchers and engineers working in the field of cloud computing to share their newest research findings and results, discuss and exchange their thoughts and information, and learn about cutting-edge technologies. The papers are solicited on a broad range of topics, including cloud computing and semantic web technologies, cloud computing models, simulations and designs, cloud computing applications, cloud computing services, mobile cloud networking, service-oriented architecture in cloud computing, Case studies and theories in cloud computing, Cloud storage and file systems, Blockchain for emerging networks, network management, measurement and analysis, and network virtualization.