This study is entitled “The Effectiveness of using scrabble game in memorizing vocabularies for class VII students of Madrasah Tsanawiyah Nurul Islam Sukorejo Pasuruan.” In this research, the writer use scrabble game as a media to increase students’ vocabulary mastery. The aims of the research are to investigate whether or not scrabble game is effective to improve students’ vocabulary mastery and also to know the students’ response by using scrabble game. The design used in this study was pre-experimental one-group pretest-posttest students. The subject of the research was the seventh grade students of junior high school in Sukorejo, Pasuruan in the Academic year 2022/2023. The writer took one class as the sample which consist 31 students.The instruments used in this research were pre-test and post-test using multiple choices questions. Pretest was given to know the scores before treatment, and the posttest score was given to know scores after treatment. The result of pretest and posttest scores was analyzed through the t-test formula to find out whether or not scrabble game is effective. Based on the computation result by using t-test formula, Ican be seen that the significance (2-tailed) <0.05, indicated that the null hypothesis (Ho) was rejected and the alternative hypothesis (Ha) was accepted. So, it can be concluded that there is significant effect of scrabble to the students vocabulary mastery at MTs Nurul Islam Sukorejo Pasuruan. Furthermore, the results of questionnaires show that most students’ gave positive response toward the use of scrabble game. Scrabble game could not only improve their vocabulary mastery, but also motivate the students in learning English. Keywords: Effectiveness, Scrabble Game, Memorizing Vocabulary