Аннотация:Life satisfaction is associated with adolescents’ adaptability, academic achievement, andmental health, and it reflects the profile of a country’s economic development. In this study, weassessed the psychometric properties of the Russian version of the Multidimensional Students’ LifeSatisfaction Scale (MSLSS). The initial adaptation of the MSLSS was performed using a sampleof primary school students. Validation on a sample of early-to-middle adolescents is necessaryto assess its reliability and validity for this age group. The sample comprised 2826 adolescentsbetween ages 10 and 16 (Mage = 12.6, SD = 1.2, 41.3% girls) who completed the Russian version ofthe MSLSS assessing their perceived life satisfaction across five scales. While the five-factor structureof the MSLSS was confirmed, the psychometric analysis indicated that the statements function more effectively measured life satisfaction as a singular one-factor construct. We also observed a significant age-related decline in overall life satisfaction and satisfaction with family, self, school, friends, and teachers. Boys reported significantly lower satisfaction with school compared to girls. This studyconfirms the validity and reliability of the Russian version of the MSLSS, thereby augmenting its general applicability. Furthermore, we replicated previously reported age and gender differences inlife satisfaction among early-to-middle adolescents.