The objective of this Special Issue is to explore the emerging field of Materials Processing through Hybrid Additive Manufacturing (AM), addressing the current limitations of standalone AM techniques in achieving fully functional components. Many advanced or hard-to-print materials still require complementary processes to meet structural and functional demands. By integrating AM with other manufacturing methods, such as subtractive machining, thermal treatments, or surface engineering, hybrid approaches offer promising solutions to enhance material performance, precision, and complexity (such as geometric complexity in printing functional fine porous structures). This issue aims to gather cutting-edge research that spans the entire hybrid AM workflow, from novel material preparation and feedstock development to advanced printing strategies and post-processing techniques. Contributions that demonstrate improvements in mechanical, thermal, or functional properties through hybridization are particularly welcome. Through this collection, we aim to foster interdisciplinary collaboration and advance the practical adoption of hybrid AM in various industrial and medical applications.