The Extended Reality and Multimedia Modelling (XR-MM) special session at the Multimedia Modelling 2026 conference invites researchers, industry experts, and enthusiasts to explore the latest advancements in extended reality (XR) and multimedia technologies. This session will focus on the development and integration of XR solutions with multimedia analysis, retrieval, and processing methods, emphasizing seamless and interactive experiences that transform the way we live, work, and interact with our surroundings.