Abstract : This research paper aims to determine the significant effect of the Berlitz Method towards Students' Vocabulary Mastery in the eighth Grade of Junior High School Berdikari Cijaku Lebak-Banten Academic Year 2023/2024. This research paper used a quantitative approach and quasi-experimental design. This research was conducted in August-September, and the researcher chose two classes, namely the control class and the experimental class. The sample selection technique is cluster random sampling; the Researcher used class VII A (20 students) as the experimental class and class VII B (20 students) as the control class. The experimental group was taught using the Berlitz Method, while the control group was taught using Talking sticks. In the data collection technique, the researcher gave a pre-test and post-test. The control group's pre-test mean was 43,53, and the experimental group's pre-test mean was 38,15. Then, the control group's post-test mean was 72,1, and the experimental group's post-test mean was 5,3. In analyzing the data, the researcher used SPSS 25 statistical calculations and post-test results of control and experimental classes to analyze hypothesis testing. Researchers found two-sided significant results = 0.000 < α 0.05. Therefore, the researcher concluded that the use of the Berlitz method had a significant impact on student's vocabulary mastery at SMP Berdikari Cijaku Lebak-Banten.

Keywords: Berlitz, Method, Vocabulary Mastery.