ABSTRACT Amelia, Jeni Mika. 2023. “Utilizing English Subtitles in YouTube Videos as Audio-Visual Media for Improving Vocabulary Mastery: A Study on Eight-Grade of SMPN 2 Secangâ€. English Study Program, Faculty of Education and Teacher Training, Universitas Tidar. Advisor I Atsani Wulansari, M.Hum., Advisor II Agnira Rekha, M.Pd. Keywords: audio-visual media, student’s eng…