This study aims to determine Physical Fitness as a Predictor of Concentration Level of State Junior High School Students in Bantul. This type of research is quantitative with a correlational approach. The sample in this study were students in Bantul State Junior High School totaling 146 students. The instrument used to measure physical fitness is the TKJI test for children aged 13-15 years, while concentration is measured using the Grid Concentration Test. Data analysis techniques using Pearson Correlation Product Moment analysis. The results showed that there was a significant relationship between physical fitness and the concentration level of students in Bantul State Junior High School. The contribution of physical fitness to the concentration level of students in Bantul State Junior High School is 32.20%, while the remaining 67.80% is influenced by other factors outside this study. Seeing the tendency of students who lack movement activities so that physical fitness, we hope that schools and educational institutions will encourage students to get more movement activities by utilizing extracurricular sports activities with maximum attention. For other researchers, research can be conducted with other independent variables, so that more variables that affect physical fitness can be identified.