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This study aimed to determine the application of guided inquiry learning models to improve student learning outcomes at class XI Mathematics and Natural Sciences 2, in 42 Public High School, Jakadrta. The research method used classroom action research. This research was conducted in two cycles, where each cycle consisted of planning, implementation, observation, and reflection. The minimum completeness criteria (KKM) indicators of learning outcomes that must be achieved are 70 with affective, cognitive, and psychomotor domains. The results showed that the average score increased in all three domains. The results of this study indicate that the average score of student learning outcomes in the affective domain of the first cycle is 68.73%, the cognitive domain of the first cycle is 60.33%, and the psychomotor domain of the first cycle is 70.17%. While the average score of affective domain student learning outcomes from the second cycle 72.33%, the cognitive domain of the second cycle 78.23%, and the psychomotor domain of the second cycle 76.61%. Based on these results, it can be concluded that the application of a guided inquiry learning model can improve student learning outcomes.