Self-regulated learning affects student academic achievement and performance. Students capable of self-regulated learning tend to achieve favorable academic performance. The aim of this study was to devise a questionnaire measuring self-regulated learning among junior high school student studying civics and social studies. A pilot survey was conducted with junior high school students in Tainan City, and the finalized questionnaire was administered to junior high school students across Taiwan through multistage sampling. The finalized questionnaire comprised 59 items from four scales: cognition regulation, motivation/affect regulation, behavior regulation, and context regulation. A total of 1,932 valid responses were collected; reliability analysis and confirmatory factor analysis revealed the scales to have satisfactory internal consistency, validity, and goodness-of-fit. The responding students exhibited a moderately high level of self-regulated learning in civics and social studies, with motivation/affect regulation being most essential for such learning. Male and female students differed nonsignificantly in their self-regulated learning. Students of different grades reported significantly different levels of self-regulated learning in civics and social studies; specifically, seventh grade students demonstrated a higher level of self-regulated learning than did those in the eighth and ninth grades, whereas the difference between the ninth and tenth grades was nonsignificant. According to the findings, learning recommendations are proposed for students in civics and social studies, teaching recommendations are proposed for teachers of the subjects, and research recommendations are made for future work. The findings may serve as a reference for junior high school students, teachers, and researchers in related fields. Overall, the designed questionnaire exhibited satisfactory quality, and its reliability and validity were verified.