Vocabulary mastery is very important to support the four language skills of listening, reading, speaking, and writing. Vocabulary is the initial stage to be taught before teaching other aspects of the language, especially for elementary school students. The importance of vocabulary teaching should be a top priority in English language teaching. The teacher becomes an important role in improving vocabulary mastery. Therefore, research has emerged related to the strategy of teachers in teaching vocabulary in elementary schools. This study aims to find out the teacher's strategy in teaching English vocabulary to elementary school students and to find out the teacher's perception in applying vocabulary teaching strategies. In this study, researchers used descriptive-qualitative research, and data collection used observation and interviews. This research was conducted in an elementary school in South Jakarta, where the respondents were two teachers. The findings of this study are classified into two themes; strategies used by teachers in vocabulary learning, and teacher perceptions in implementing these strategies. The results showed that English teachers applied image strategies, YouTube videos, songs, and games. Based on the teacher's perception, the strategies used during the learning process in the classroom are more effective for teaching vocabulary to elementary school students because they adapt to the characteristics of students who prefer to play while learning. The selection of learning strategies is also based on the needs of students, levels, and materials. Therefore, teachers teach by applying various activities and strategies to make students enjoy the process of learning vocabulary in the classroom more.