The study is aimed to detect the availability of the concepts of intellectual security in the books of Islamic culture for grades eleven and twelve, and that by answering the following two questions . 1 - What are the intellectual concepts of security that should be included in books of Islamic culture for grades eleven and twelve in the Sultanate of Oman? 2 - What is the availability of the concepts of intellectual security in the books of Islamic culture for grades eleven and twelve in the Sultanate of Oman? To answer the questions of the study, the researcher referred to educational literature and sum up the concepts of intellectual security that should be included in the books of Islamic culture and classified them in four categories The study sample consisted of all the books of Islamic culture for grades eleven and twelve, scheduled for the academic year 2010/2011 in the Sultanate of Oman, with (4) books. And most of the findings of the study: 1 -the total frequency of security-related to intellectual concepts in both grades is (365), which suggests a kind of interest in this kind of concepts in the books of Islamic culture. 2-the category of the concepts relate to intellectual security among the young Muslims comes in the first place with frequency of concepts (204) times with a rate (55.89%), which is the highest availability in all categories.. 3 - the category of the concepts relate to intellectual security with non-Muslims comes at the second place, and the total frequency of the concepts of this category is (70) times, with a rate of (19.18%). 4 - the third category was (some set of Islamic legal terms relating to intellectual security, with a total of frequencies is (47) time, with a rate (12.88%). 5 - the fourth category is the warming up concepts related to intellectual security, with a total of frequencies of (44) time, with a rate (12.05%). The recommendations: 1-Decision-makers can benefit from a list of the concepts of intellectual security reached by the current study, when planning for the merged or included in the curricula of education and Islamic culture in general, and in the development of curricula of Islamic culture in grades eleven and twelve in particular. 2- The necessity to achieve balance between the concepts of intellectual security according to the different categories and develop a conceptual system of intellectual security in grades eleven and twelve, and presented them explicitly rather than implicitly.