Progressive failure analysis (PFA) is a computational methodology used to predict the gradual degradation and ultimate failure of laminated composite materials under various loading conditions. Laminated composites consist of plies with different fiber orientations stacked on top of each other, each possessing different material properties. Consequently, they exhibit complex failure mechanisms where initial damage progresses with increasing applied loads. This chapter provides a comprehensive assessment of the PFA approach and its application to the structural integrity and failure behavior of laminated composites. The PFA analysis begins with the characterization of material properties, starting with ply-level mechanical properties and an acceptable failure criterion. Subsequently, progressive failure models, such as damage initiation and propagation set of rules, are integrated into finite element analysis codes to simulate the failure mechanisms within the laminate. The PFA considers various failure modes in each layer, including matrix cracking, fiber breakage, and delamination, recognizing that each layer of laminated composite has anisotropic and heterogeneous properties. The study must consider the influence of factors such as loading conditions, environmental effects, and manufacturing defects on the progressive failure behavior of laminated composites. Special attention is given to validating PFA predictions through experimental testing, ensuring the reliability and accuracy of the simulation results. Analysts should gauge the analysis based on experimental data that can provide valuable information for optimizing the design and manufacturing methods of laminated composites. Progressive failure analysis serves as a powerful tool for understanding and predicting the complex failure mechanisms in laminated composites. The integration of advanced computational techniques with experimental validation contributes to a better design and structural reliability of composite materials in engineering applications. A practical example problem on the PFA approach is provided in this chapter to offer a clear understanding of the analysis steps for engineers.