This book constitutes the refereed conference proceedings of the Third Asian Symposium on Cellular Automata Technology, ASCAT 2024, held in Durgapur, India, during February 29 - March 2, 2024. The 15 full papers presented in this book were carefully reviewed and selected from 33 submissions. The symposium aims to explore the latest advancements, methodologies, and interdisciplinary connections that showcase the versatility and potential impact of cellular automata in contemporary research.