180 Volume 2 Number 3, November 2022 e-ISSN 2798-6543 p-ISSN 2798-5164 Pages: 180-186 IMPROVING STUDENTS’ VOCABULARY MASTERY BY KIDS’ ANIMATION MOVIE Ratri Mindarti 1 , Rudha Widagsa 2 1,2 Universitas PGRI Yogyakarta, Jl. PGRI Sonosewu No 117, Sonosewu, Kasihan, Bantul 55182 Yogyakarta, Indonesia Corresponding Author(S): Ratri Mindarti Abstract: Keywords: The low ability to master vocabulary can be caused by many things. Ignorance of these factors can cause teachers to be confused to determine the right method in teaching English vocabulary. This study aims to determine the effectiveness of animation movie in students' vocabulary mastery. The population of this study was grade 8 of a Junior High School in Yogyakarta with a sampling of 34 students in class 8F. The data were obtained from vocabulary knowledge in the pre-test and post- test. The total items of pretest and posttest were 40 items for each. After giving the pretest and posttest, then the researchers analyzed the data. The research findings showed that the students of grade 8F had fewer scores in the pretest. After being given treatment, vocabulary mastery was improved. The mean score of the students was 70.00 on the pretest and became 85.44 on the post-test. Therefore, it can be concluded that the use of kids’ animation movie effectively improved students’ vocabulary mastery. English learners; Vocabulary Mastery; Animation Movie Creative Commons Attribution 4.0 International License INTRODUCTION Nowadays, young English learners needs to learn vocabulary due to its benefits to support their communicative skill. In addition, Munirah and Hardian (2016) state that vocabulary could be one of the indicators of the one's language skills or competence (p.79). In summary, students’ ability in language can be seen from their mastery of vocabulary. The greater a person's vocabulary, the greater his or her knowledge base. In addition to structure, grammar, and pronunciation, vocabulary is highly important in learning English because if a student does not grasp the vocabulary, it will be difficult for him to explain what is on his mind both orally and written (Hidayati, 2020) A language aspect that has been the most important or crucial is vocabulary in which it becomes a tool to communicate. In other words, meanings can be understood by mastering written and spoken words vocabulary. Before the English learners obtain reading, listening, speaking, and writing skills, it is necessary to learn vocabulary. Above all, the first step in learning a language is mastering vocabulary (Pratama, Nurweni, & Huzairin, 2016). During the time spent English learners learning vocabulary, there are a