In this Article concept of state secret will be primarily explained and argued and afterwards with this concept crimes against state secrets in Turkish Criminal Code will be handled. To concept of state secret will be approached in politicaland legal point of view. State secrets' political outline will be drawn and its historical development progress presented. State secrets' place with the context ofseparation of powers and nature of information which it contains are examined.When this examination occurs, disputes on state secret concept's natures whichensuring privilege and exemption from law and examples from different countries'regulations and precedents will be given. European Convention on Human Rightwill be used for examining state secret concept's scope and content. Since the concept of state secret and its frame is explained, crimes against state secrets thatforeseen in Turkish Criminal Code provisions on documents relating to state security, securing information relating state security, political or military espionage,disclosure of information relating to the security and political interests of the state,disclosure of information which must be kept confidential, international espionage, entering military zones, exploitation of state secrets and disloyalty in government services, securing prohibited information, securing prohibited information for espionage, disclosure of prohibited information, disclosure of prohibited information for military or political espionage, espionage through recklessness, possession of documents concerning state security will be examinedand explained.