Mechanics of Composite, Hybrid, and Multifunctional Materials, Volume 5 of the Proceedings of the 2023 SEM Annual Conference & Exposition on Experimental and Applied Mechanics, the fifth volume of five from the Conference, brings together contributions to this important area of research and engineering. The collection presents early findings and case studies on a wide range of areas, including:Advances in CompositesRecycled CompositesTunable MaterialsDamage Detection in CompositesMultifunctional CompositesFracture and Failure in Complex Materials