Habitual getting to know is studying using repetition in a learning manner. Studying strategies are unique actions taken by way of the learner to make mastering less difficult, faster, more directed, greater effective. Students do something on a daily schedule. This challenge is used to succeed in teaching new things to students. In short, habitual learning is widely used. Many Indonesian students can watch movies to improve their vocabulary, grammar, pronunciation, spelling, and more. The habit of watching movies using English subtitles can be one of the learning media to increase students' vocabulary mastery. Using English subtitles while watching movies also provides an opportunity to learn vocabulary, acquire new vocabulary, and find lots of information about grammar to help with language skills. The aims of the research were to find out whether or not there is any significant correlation between students’ habits in watching movies using English subtitles and vocabulary mastery at the English Department Universitas Islam Malang. The research design was quantitative method. In collecting the data, the researcher used questionnaire and test. The population of the study were the eight semester students of English Department Universitas Islam Malang. The sample of the study consisted of 37 students. To analyze the data, the researcher used SPSS 26.0 Program. The research findings show that there is any correlation but insignificant between students’ habit in watching movies using English subtitle and vocabulary mastery at English Department Universitas Islam Malang (rxy = 0.155≤rtable = 0.325). So, the alternative hypothesis (Ha) is accepted and null hypothesis (Ho) is rejected. The meaning of this statement is the students’ habit in watching movies using English subtitle has a relationship but insignificant to students’ vocabulary mastery. Based on the finding of the study, it is addressed to English students to apply this strategies to improve their vocabulary mastery. For the next researchers are expected to investigate about other skills and component of English and explore knowledge in order to give more benefit on the research result and by involving more participants. Keywords : Correlation, Habit, Watching Movies Using English Subtitles, Vocabulary Mastery