ABSTRACT Prasetya, N. T. P. (2024). Enhancing the Students’ English Vocabulary Mastery through Undercover Game in the Fifth Graders of SDN Borobudur 1 Magelang. An Undergraduate Thesis. English Education Department, Faculty of Education and Teacher Training, Universitas Tidar, Advisor I Moch. Malik Al Firdaus, M.Pd., Advisor II Taufik Arochman, M.Pd. Keywods: English Vocabulary Mastery…