This study discusses the effect of mastery of the Aqidah Akhlak lesson on the social behavior of Islamic Senior High School students. Variable research that becomes the focus of this study is mastery of Aqidah Akhlaq materials and social behavior of Islamic Senior High School students. This study is associative research with quantitative data. Data were collected by observation, documentation, interview, and questionnaire. The data was analyzed by using a descriptive test and product-moment

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... elation test. This study generates some conclusions that are: First, after being analyzed descriptive statistic method, we found that the average score of Islamic Senior High School student's Aqidah Akhlaq mastery is 85. This score is at intervals 80-86, which is medium/pretty good. So it can be concluded that the mastery of Aqidah Akhlak of Islamic Senior High School students is good enough. Second, the level of social behavior of Islamic Senior High School students was tested and analyzed by descriptive statistic method, and the result was 79. This score is at intervals of 73-80; that is good enough. So, the social behavior of Islamic Senior High School students is a good enough state. Third, there is a relation or positive influence between the mastery of Aqidah Akhlaq mastery and the social behavior of Islamic Senior High School students, with the value of product-moment correlation as much as rxy = 0,254. This correlation indeks relatively weak, but the average of each variable is quite good on descriptive statistic testing. The calculation of the determinant coefficient obtained that the level of mastery of Aqidah Akhlak lesson only gives contribution as much as 6,455 % to the social behavior of Islamic Senior High School students. On the other hand, the rest of 93,55% was influenced by another variable.