Nanotechnology is a science and engineering discipline that deals with designing, producing, and using structures, devices and systems by manipulating atoms and molecules at the nanoscale. There are several applications of nanotechnology in various sectors, including information technology, security, medicine, transportation, energy, food safety and environmental science. The major objective of the application of nanotechnology in drug delivery is to improve treatments with targeted delivery and fewer side effects. It is generally performed through the usage of designed nanomaterials, as well as forming delivery systems from nanoscale molecules like liposomes. There are various advantages of applying nanotechnology in drug delivery systems, such as providing site-specific targeting in order to reduce the accumulation of drug within healthy tissue. Furthermore, it facilitates effective treatment by retaining the drug for a sufficient time in the body. This book explores the design and applications of nanotechnology in drug delivery systems. The various studies that are constantly contributing towards advancing technologies and evolution of this field are examined in detail. This book will help new researchers by foregrounding their knowledge in this branch of science.