The field of chemistry is constantly evolving, blending traditional concepts with cutting-edge advancements to meet the needs of modern science. Fundamentals and Applications: Nano, Medicinal, and Organic Chemistry aims to provide a comprehensive exploration of three key branches of chemistry4organic, medicinal, and nano chemistry4bridging foundational knowledge with real world applications. This book is designed to cater to undergraduate and postgraduate students, educators, and researchers, offering a balanced blend of theory and applied science. Each chapter is meticulously crafted to present fundamental principles, followed by their practical relevance in areas like medicine, drug discovery, nanotechnology, and advanced organic synthesis. The integration of organic chemistry with medicinal and nano chemistry provides a holistic perspective on how molecular science impacts health, technology, and innovation. This book reflects the collaborative effort of experienced professionals and subject matter experts, ensuring accuracy, clarity, and accessibility. It aims to spark curiosity, foster understanding, and inspire innovation in readers. We hope this book serves as a valuable resource, encouraging further exploration in these fascinating fields of chemistry.