This book is a collection of best-selected research papers presented at Third International Conference on Intelligent Systems and Sustainable Computing (ICISSC 2023), held in School of Engineering, Malla Reddy University, Hyderabad, India, during December 22-23, 2023. The book covers recent research in intelligent systems, intelligent business systems, soft computing, swarm intelligence, artificial intelligence and neural networks, data mining and data warehousing, cloud computing, distributed computing, big data analytics, Internet of Things (IoT), machine learning, speech processing, sustainable high-performance systems, VLSI and embedded systems, image and video processing, and signal processing and communication. Chapters 7 and 32 in this book is available open access under a CC BY 4.0 license at link.springer.com.