Delamination in laminated composites is a mode of failure where plies separate, posing a significant challenge to the structural integrity and performance of laminated structures. This chapter provides a comprehensive discussion related to the mechanisms leading to delamination, discusses methods for detection, and ways of preventing failure due to delamination growth and final structural breakdown. The initiation and propagation of delamination in laminated composites are influenced by factors such as loading conditions, material properties, manufacturing processes, and environmental effects. Understanding each of the above parameters is crucial for designing a composite resistance structure. Nondestructive examination (NDE) techniques, including ultrasonic testing, thermography, and acoustic emission, play an important role in detecting delamination due to impact prior to part’s usage and throughout structural life to prevent delamination growth that may lead to catastrophic failure are all discussed in chapter 14. Improved manufacturing processes, proper selection of material, and novel design approaches can be helpful to prevent delamination. Insertion of a thin adhesive film between layers of reinforcing fibers can be helpful to minimize the ply separation and growth of delamination. Additionally, enhancing interlaminar fracture toughness and preventing delamination propagation will be useful to prevent delamination from advancing. Finally, a comprehensive understanding of delamination mechanisms and the implementation of effective ways of preventing it are essential for advancing the application and performance of laminated composites in diverse engineering fields.