This chapter explores the transformative potential of Additive Manufacturing (AM) in thermal management across various industries, including aerospace, automobiles, and electronics. By delving into the fundamentals of heat transfer, material selection, and design strategies, this comprehensive review evaluates the benefits and challenges of various AM techniques, such as Selective Laser Melting and Electron Beam Melting. The applications of advanced materials, including metals, ceramics, polymers, and composites, are investigated, along with their high-temperature properties. Real-world case studies demonstrate the advantages of AM in achieving low-cost, high-performance thermal solutions, while also discussing economic, environmental, and regulatory considerations. Finally, the chapter identifies future research directions, including multi-material printing and functionally graded structures, highlighting AM's potential to revolutionize thermal management and solve future problems in thermal engineering.