Physician’s obligation to keep secret, in other words, keeping patient’s medical data dark by a physician maintained importance in medical science as a professional value almost for 2500 years. We encounter with physician’s obligation to keep secret as a traditional, ethic and lawful subject. This obligation is based on the Constitution, Turkish Civil Code, Turkish Code of Obligations, Turkish Penal Code. The confidentiality for physician in Turkish law is also regulated in the legislation of the medical profession, which includes various laws and regulations.The obligation to keep secrets, as a rule, applies to every third party. There are some situations in law eliminating the obligation to keep secrets. In such cases, the physician is obliged to reveal the secrets of the patient to the relevant people and institutions, and the physician who discloses the secret of her/his patient will not have any responsibility.