CATIA V5-6R2021 for Engineers and Designers textbook is written with the intention of helping the readers effectively use the CATIA V5-6R2021 solid modeling tool. This textbook provides a simple and clear explanation of tools used in common workbenches of CATIA V5-6R2021. \nAfter reading this textbook, you will be able to create models, and assemble and draft them. The chapter on DMU Kinematics workbench will enable the users to create, edit, simulate, and analyze different mechanisms dynamically. The chapter on FreeStyle workbench will enable the users to dynamically design and manipulate surfaces. The chapter on Generative Shape Design explains mechanical engineering industry examples and tutorials used in this textbook ensure that the users can relate the knowledge of this textbook with the actual mechanical industry designs. In addition, a chapter on FEA and structural analysis has been added to help users to analyze their own designs by calculating stresses and displacements using various tools available in the Advanced Meshing Tools and Generative Structural Analysis workbenches of CATIA V5-6R2021.