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Abstract This review highlights recent progress in additive manufacturing (AM) techniques for polymer composites reinforced with nanoparticles, short fibers, and continuous fibers. It also explores the integration of functional resins and fibers to enable advanced capabilities such as shape morphing, enhanced electrical and thermal conductivity, and self-healing behavior. Building on these advances, the review examines computational design strategies that optimize material distribution and fiber orientation. Representative approaches range from density-based methods to emerging level-set topology optimization frameworks, with objectives evolving from improving mechanical performance to addressing complex multi-physics functional requirements. The review also identifies emerging opportunities, including the need for technological innovations to further improve mechanical properties and enable adaptable multifunctionality. Further advances in theoretical modeling and integrated design-printing workflows are also discussed. By synthesizing these developments, this review aims to foster interdisciplinary collaborations and accelerate innovation in AM-enabled composite materials across a wide range of applications.