This research aimed to examine the effect of guided inquiry learning model toward concept mastery and critical thinking ability of physics of X grade students of SMAN 1 Kuripan in academic year 2017/2018. This research was an experimental research with post test only control group design. The population of this research was X MIA students consicted of 3 classes with the total number of the students was 30 for each class. The sample was chosen using cluster random sampling technique. Technique

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... collecting data of the mastery concept and critical thinking ability using essay test. Gained data was analyzed using manova test. The result of hypotesis test showed , so it was concluded that there was an effect of guided inquiry learning wodel on the mastery of concept and critical thinking ability of physics of X grade students of SMAN 1 Kuripan in academic year 2017/2018.