The course "Engineering Materials" (Course Code 5591301) is classified under the specialized course category—specifically the engineering fundamentals group—within the Bachelor of Engineering program in Electrical Engineering (New Curriculum, 2021). This teaching material has been compiled based on the author's teaching experience and extensive research into both Thai and foreign textbooks; the content focuses on the fundamentals of engineering materials and their practical applications. This document serves as a primary resource for students, aiming to facilitate effective instruction and learning. Students are encouraged to consult additional references listed in the bibliography at the end of the document. The content aligns with the course description and comprises ten chapters, designed to provide students with knowledge and understanding of crystal structures, material properties, material testing, phase diagrams, manufacturing processes, and metal forming. Furthermore, it enables students to apply their knowledge of various engineering materials—including metals, polymers, ceramics, composites, semiconductors, concrete, asphalt, and wood—appropriately to engineering tasks.