Today technology plays a vital role in every aspect of life. Increasing standards in technology in many fields particularly in medicine, has taken man today to high esteem. Nanotechnology is a new technology that is knocking at the doors. The multidisciplinary field of nanotechnology’s application for discovering new molecules and manipulating those available naturally could be dazzling in its potential to improve health care.The spin-offs of nanotechnology could be utilized across all the countries of the world. In the future, we could imagine a world where medical nanodevices are routinely implanted or even injected into the bloodstream to monitor health and to automatically participate in the repair of systems that deviate from the normal pattern.However, nanotechnology in medicine faces enormous technical hurdles in those long delays and numerous failures are inevitable.This book focuses on those areas in which nanotechnology is having a direct impact and includes diagnostics, drug discovery and delivery, surgery, tissue engineering and retina implants,recent developments.