Functionally graded materials (FGM) are composite materials with a gradual variation in composition and microstructure across their length, which allows for tailoring their mechanical, thermal, or electrical properties to meet specific design requirements. The field of FGMs is now well established but in recent years attention has turned to nano and microscale FGMs and they are being extensively studied due to their potential applications in advanced technologies such as micro-electro-mechanical systems (MEMS), nanoelectro-mechanical systems (NEMS), biomedical devices, etc. The objective of this book is to bring together the latest research and developments in the area of bending, buckling and vibration analysis of functionally graded nano and microstructures.