Ex post facto correlational research was used as the design of this research to find out the significant correlation between grammar mastery and writing ability of the eighth-grade students of SMPN 5 Mengwi in academic year 2021/2022. Grade eight students from SMPN 5 Mengwi were used as the population for this study and through sampling method using lottery system, 64 students were selected as samples. Data were collected by through a writing test and a paragraph construction test. Pre-requisite analysis and hypothesis testing were performed to analysed the data obtained. The data were found to be normally and homogeneously distributed. As a result of the hypothesis test, the alternative hypothesis (Ha) was confirmed. In short, the findings confirm a significant correlation between grammar mastery and writing ability of the eighth-grade students of SMPN 5 Mengwi in academic year 2021/2022. Therefore, the result of the study can be used as the reinforcement for a teacher to teach grammar to the students, since a good grammar mastery can give an opportunity to have a better writing ability.
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