THE IMPACT OF TIKTOK VIDEOS AND BBC LEARNING ENGLISH VIDEOS AS A MEDIA ON STUDENTS' VOCABULARY MASTERYNia RahmaRifaauthorVocabulary mastery is a key aspect of learning English, but many students still have limited word knowledge and low retention when using conventional methods. This study investigates the impact of TikTok videos and BBC Learning English videos on students’ vocabulary mastery. Using a quasi-experimental design with a quantitative approach, the research involved two groups: an experimental group using TikTok videos and a control group using BBC Learning English videos. A total of 62 tenth-grade students at a vocational high school were randomly selected as the sample. Pre-test and post-test were given to assess their vocabulary knowledge, using 23 multiple-choice and 7 matching tasks related to procedural text vocabulary. The results, analyzed using SPSS, showed that the independent samples t-test confirmed a significant difference between the two groups (t = 2.346, df = 60, p < 0.05). These findings indicate that while both media are effective, TikTok’s engaging and authentic content helps students learn and remember vocabulary more easily. Therefore, combining informal digital media like TikTok with structured resources is recommended to make vocabulary learning more effective and enjoyable in EFL classrooms. Keywords: Vocabulary mastery, TikTok videos, BBC Learning English videosPENDIDIKAN BAHASA INGGRIS2025Universitas Pakuan;Pendidikan Bahasa InggrisThesis