The objective of this study was to find out the significant correlation between students’ habit of watching English movies and vocabulary mastery of the tenth-grade of SMAN 1 Kuta Selatan in academic year 2020/2021. The sample of this research were 38 students of SMAN 1 Kuta Selatan. For collecting the data, there were two instruments used which were a questionnaire to find out the students’ habit of watching English movies and the multiple-choice test item for vocabulary mastery. The questionnaire used included aspects such as frequency, repetition, and automatic behaviour of habit of watching English movies, while the multiple-choice test item consisted of noun, verb, pronoun, and adjective. The SPSS 23.0 program was used to analyse the data. The result of Pearson Product Moment showed that the r-counted was 0.707. It lied between 0.600-0.800 which was in a sufficient level. It showed that there was a positive and significant correlation between students’ habit of watching English movies and vocabulary mastery of the tenth-grade of SMAN 1 Kuta Selatan in academic year 2020/2021.
                        
                        
                        
                        
                            
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