Fiber orientation refers to the alignment of fibrous materials within a composite structure. It plays a crucial role in determining the mechanical properties and performance of the material. In composite materials, such as Carbon Fiber Reinforced Polymers (CFRP) or fiberglass, fibers are typically arranged in specific orientations to optimize strength, stiffness, and other desired characteristics. The orientation of fibers affects various mechanical properties, including tensile strength, compression strength, and stiffness. For example, aligning fibers parallel to the direction of applied stress enhances tensile strength, while perpendicular alignment improves compression strength. Moreover, fiber orientation influences anisotropic behavior, where mechanical properties vary with direction. Manufacturers employ different techniques to control fiber orientation during the fabrication process, such as weaving, knitting, or laying fibers in specific directions. Advanced methods like Automated Fiber Placement (AFP) and Automated Tape Laying (ATL) enable precise control over fiber orientation, enhancing material performance. The topics included in this book on fiber orientation are of the utmost significance and bound to provide incredible insights to readers. Most of the topics introduced herein cover new techniques and the applications of fiber orientation. This book, with its detailed coverage, will prove immensely beneficial to professionals and students involved in this area at various levels.