This study aimed to analyze the mediating role of pesantren climate in the relationship between self-concept and social support and the subjective well-being (SWB) of Qur’an-memorizing santri. A quantitative approach with a correlational survey design was employed at Bina Madani Islamic Boarding School in Magelang, Indonesia. The accessible population consisted of 198 female students in Grades 10–12, of whom 143 were selected as the main sample using purposive sampling based on predetermined inclusion criteria. Data were collected using five-point Likert scales measuring social support, self-concept, pesantren climate, and SWB. The instruments were tested in a pilot study involving 30 santri and demonstrated adequate to very high reliability (Cronbach’s α = 0.769–0.935). Data were analyzed using Pearson correlation and mediation analysis with PROCESS Macro Model 4 and 5,000 bias-corrected bootstrap samples. The findings showed that pesantren climate was strongly correlated with SWB (r = 0.811, p < 0.001) and had a positive effect on SWB (B = 0.808, p < 0.001). Social support had a significant indirect effect on SWB through pesantren climate (effect = 0.155, 95% CI [0.072, 0.251]), whereas its direct effect was not significant. Self-concept demonstrated significant direct and indirect effects through pesantren climate (effect = 0.197, 95% CI [0.064, 0.345]), indicating partial mediation. These findings highlight the importance of strengthening pesantren climate as a contextual mechanism for promoting the subjective well-being of Qur’an-memorizing santri.
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