This book constitutes the refereed proceedings of the Third International Conference on Cognitive Computation and Systems, ICCCS 2024, held in Linyi, China, December 20–22, 2024.The 54 revised full papers presented in these proceedings were carefully reviewed and selected from 155 submissions. The papers are organized in the following topical sections:Part I: Cognitive computing and information processing; Intelligent cooperative control; and Learning and systems.Part II: Cognitive computing and information processing; Intelligent cooperative control; and Learning and systems.