This study aimed to determine the effect of reading interest in the library on the learning outcomes at grade IV SD Negeri 7 Pardugul in the academic year 2020/2021. The population was 50 students and all of them were chosen as the samples of this study. This research utilized a quantitative method with a survey type. The method used in this research was a quantitative method. Then, the hypotheses were tested by using t test. The results of this study showed that there was a significant effect of reading interests in the library on the learning outcomes of the fourth grade students at SD Negeri 7 Pardugul in the academic year 2020/2021. This finding was supported by the value of tcount> ttable, which was 3.204> 1.675. Hence, H0 was accepted,meaning that there was a significant effect of reading interests on students’ learning outcomes. Based on the results of this study, it can be concluded that reading interests has an effect on students’ learning outcomes.