This research aimed to find out whether the effect of using Wattpad in Improving students’ Reading Comprehension or not at Tenth Grade Students of SMA Negeri 9 Makassar. This research used quantitative research with a pre-experimental approach. The researcher gave pre-test to students, and then the researcher gave the students’ treatment using Wattpad Application. After treatment is given, researcher gives the students’ post-test. The population in this study were students of the class X SMA Negeri 9 Makassar. The sample of this research was the students of the class X.7, included 29 students. The sample was taken by Purposive Sampling. The result showed that the t-test value was higher than the t-table value. The t-test value of reading comprehension in terms of Literal Comprehension was higher than the t-table (14.75>2.04841), and the t-test value in terms of Interpretative comprehension was higher than the t-table (15.17>2.04841). The t-test of the indicators in the students' Reading Comprehension skills t-test produced a result that was higher than the t-table (29.92>2.04841). It was concluded that the null hypothesis (H0) was rejected and the alternative hypothesis (H1) was accepted. It means that using the Wattpad application was effective to improve students’ reading comprehension.