In this study, The Math and Science Engagement Scales developed by Wang et al. (2016) was adapted to Turkish in the context of science course and, the validity and reliability studies were conducted. The original version of the scale consists of 4 dimensions and 33 items. These dimensions are; cognitive engagement, behavioral engagement, emotional engagement, and social engagement. During the adaptation phase, the items were translated into Turkish by three experts. The Turkish forms were examined and the draft form of the scale was obtained by the researchers. Then, the two experts of the two languages were examined through the language equivalence expert form for word usage and cultural suitability. The participants of the study consisted of 519 students in 6., 7., and 8. grades studied at two secondary schools in a small scale city in the south east of Turkey during the 2019-2020 academic year. The convenience sampling method was used to determine the participants. Confirmatory factor analysis (CFA) was applied to the data obtained after the implementation. The fit index values obtained as a result of CFA (χ2 / df = 1.75; RMSEA = 0.038; SRMR = 0.049; RMR = 0.072; CFI = 0.98; NFI = 0.96) show that the 4-factor structure of the scale is acceptable. As a result of the reliability analysis, the Cronbach alpha reliability coefficient of the Turkish form of the scale was 0.90 and the Guttman Split-half coefficient was 0.81. Finally, it can be said that the validity and reliability of the 33-item and 4dimensional Turkish form of the scale adapted with this study can be used to determine student engagement in science classes. Add your abstract here.