Background: One of the moral and legal concerns caused by the development and application of nanotechnology relates to the issue of privacy. The core of this concern is formed by the radio frequency identification (RFID). RFID chips, by the application of nanotechnology, have been produced much more effective, smaller and cheaper than the ones produced in the past. Nowadays, these tags are being used for tracking, registration and prevention of theft of the goods of large shops. Saved data on RFID chips are easily accessible, even after the sale of the tagged goods and outside the shop, by an electronic reader and, hence, the person who carries the goods is unknowingly traceable. Widespread use of RFID tags, as it stands at the time being, i.e. with no security consideration, seriously threatens the privacy of individuals. This research, by studying the manner in which the privacy of individuals are violated by incorrect use of nanotechnology and explaining the significance of privacy in the ethical lives of individuals and considering its status under international and various local legal systems, including the Iranian one, endeavors to inform the society of these potential risks and the ways to deal with them.Conclusion: Since violation of privacy puts in danger the principles of dignity, autonomy, intimacy and ultimately the foundation of individuals’ moral lives, it is necessary that, while observing the moral principles, certain legal solutions be arranged on the basis of which the benefits of RFID are kept, whereas possible abuses of it for threatening citizen rights and security are eliminated.