Abstract Name : Wahyu Mubarak Student No. : 1006102050006 Study Program : English Education Title : The Efforts Made By Senior High School Students In Increasing Vocabulary (A Case Study at SMAN 7 Banda Aceh) Keywords: Efforts, Vocabulary. Vocabulary is an essence part that has to be mastered by L2 learners in learning a foreign language. Therefore, this study intended to find out the efforts made by senior high school students in increasing vocabulary. It discusses about the efforts made by senior high school students in increasing vocabulary. This study used descriptive qualitative. The subject of this study was the students of second year class XI-Science-1, SMAN 7 Banda Aceh. The instrument used in this study was interview. The findings shows that the all respondents (10 students) made all efforts suggested by English language teaching experts in increasing their vocabulary, i.e. learning words by wide reading, learning words by using dictionary, learning words by making a vocabulary notebook, learning words by rote memorization, and learning words by repetition. Hence, it is very important for English language teachers to encourage their students to make those efforts to increase their students’ vocabulary.