While TikTok videos have shown promising effects on vocabulary learning among junior and senior high school students, further research is warranted to assess their impact on vocabulary mastery in twelfth-grade students specifically. This study seeks to evaluate the effectiveness of TikTok videos in enhancing vocabulary mastery among twelfth-grade students in senior high school. Employing a quasi-experimental design, the research involved 70 students divided equally into an experimental group and a control group. The data were collected in both groups through pre-tests and post-tests using multiple-choice items to measure students’ vocabulary mastery. The results from the statistical analysis of the paired-sample t-test indicated a significant improvement in vocabulary mastery for students using TikTok videos. This made strong evidence that TikTok videos were significantly effective in enhancing vocabulary acquisition among the twelfth-grade students. Although the study involved only a specific group of words, it offers valuable insights for educators seeking innovative strategies to improve students’ vocabulary acquisition through engaging digital media.
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