This book discusses the various modes and methods of nano-based drug delivery in different types of cancers such as colon, breast, cervical, ovarian, and lung cancer. It reviews the significance of nano drug delivery in cancer therapy, the application of nanoparticles in overcoming drug resistance, targeted therapy, and immunotherapy. The book also covers topics related to the synthesis of different types, shapes, and sizes of nanocarriers using synthetic and biological approaches. Further, a chapter explores the synthesis of nanocarriers loaded with anti-cancer drugs by using functionalization or conjugations and encapsulation methods. The book also examines the nanocarriers as delivery vehicles for chemotherapeutic agents against cancers using in vitro and animal models of cancers, preclinical trials for efficacy, and safety profiling of nanocarriers. Finally, future trends and innovation in nano drug delivery for cancer therapy, application of siRNA (nanoparticle-based RNA) therapy, ultrasound-linked nano-cancer therapeutics, and application of exosome-based cancer therapy topics are discussed. Towards the end, the book examines the limitations of nanocarriers, including the cell and tissue toxicity, genotoxicity, and scale-up of nanomaterials, health and environmental hazards associated with nanoformulation synthesis, respiratory diseases, government regulations, and ethical issues.