This book gathers high-quality research papers presented at the 3rd International Conference on Frontiers in Computing and Systems (COMSYS 2022) held at Indian Institute of Technology Ropar, Punjab, India, during December 19-21, 2022. The book covers research in "cyber-physical systems for real-life applications" pertaining to AI, machine learning, and data science, devices, circuits, and systems, computational biology, biomedical informatics and network medicine, communication networks, cloud computing and IoT, image, video and signal processing, and security and privacy.