This research aims to: (1) analyze the effects of social support on the learning achievement of class X students at Muhammadiyah Boarding School Sleman Yogyakarta and Ibnul Qoyyim Islamic female boarding school: (2) study the effects of psychological well-being on the the learning achievement of class X students at Muhammadiyah Boarding School Sleman Yogyakarta and Ibnul Qoyyim Islamic female boarding school; (3) find out the most dominant variable influencing students learning achievement between social support and psychological well-being. This type of research uses descriptive correlational research with a quantitative approach. The research location is Muhammadiyah Boarding School Sleman Yogyakarta and Ibnul Qoyyim Islamic female boarding school. Samples in Muhammadiyah Boarding School Sleman Yogyakarta were 29% of the population of 175 santri, so a sample of 50 santri. In Ibnul Qoyyim Islamic female boarding school there were 67% of the population of 75 santri, so there were also 50 santri. Methods of collecting data using questionnaires, observation, interviews, documentation. The data were analyzed using regression analysis techniques. The findings reveal that: (1) Social effect has an effect on students’ learning achievement at Muhammadiyah Boarding School Sleman Yogyakarta and Ibnul Qoyyim Islamic female boarding school. Social support and psychological well-being have contributed to the students’ learning achievement by 20,3 % at Muhammadiyah Boarding School Sleman Yogyakarta and by 35,2% at Ibnu Qoyyim Islamic female boarding school. (2) Social support affects the learning achievement of students of class X, both at Muhammadiyah Boarding School Sleman Yogyakarta (p = 0.002) and Ibnul Qoyyim Islamic female boarding school (p = 0.034). (3) Psychological well-being has no effect on the learning achievement of class X students both at Muhammadiyah Boarding School Sleman Yogyakarta (p=0,200) and Ibnul Qoyyim Islamic female boarding school (p=0,226). (4) It is concluded from finding 2 and 3 that social support has more dominant effect on students’ learning achievement both at Muhammadiyah Boarding School Sleman Yogyakarta and Ibnul Qoyyim Islamic female boarding school.