This book presents select proceedings of the 6th International and 21st National Conference on Machines and Mechanism (iNaCoMM 2023) which covers the broad areas of solid mechanics and design covering the latest advancements in the fields of machines and mechanisms. The topics covered in the book are categorized into four themes, namely machines and mechanisms; vibration and control; materials and machine design; and robotics. This book is a useful reference for researchers and professionals working in the fields of mechanical engineering.