This proceedings gathers selected, peer-reviewed papers presented at the XXXI International Joint Conference on Industrial Engineering and Operations Management (IJCIEOM), held from June 23 to 25, 2025, in Bari, Italy.The works gathered in this volume cover key aspects in the fields of operations, manufacturing, industrial and production engineering, and management. Topics include production engineering and operations management; logistics; operations research; transport system engineering; supply chain risk and resilience; last mile delivery optimization; stochastic inventory models and optimization; and more.Deeply rooted in real-world cases, the studies contained within offer valuable insights not only to academic researchers but also to professionals and practitioners seeking solutions for the intricate industrial challenges of today.