Vocabulary is a fundamental aspect of learning English. Without adequate vocabulary, learners find it difficult to communicate, express ideas or opinions, comprehend simple text, and listen to instruction. Authentic materials refer to pictures, photographs, video selection, and radio. This study sought to find out the following questions: How is the vocabulary ability of students who were taught using authentic materials through multimedia and authentic materials only? Is the vocabulary enhancement of those students who are taught using authentic materials through multimedia is better than those students who are taught using authentic materials? What are the students' responses toward the use of authentic materials and multimedia? The study was a quantitative research method and a comparative design by using pre-test and post-test. The populations of this study were 10th grade of senior high school students. The instruments used in this study were the vocabulary test and questionnaire. The result of this study showed that both groups have enhanced the vocabulary ability with the mean score of the pre-test was 53.93 for authentic materials through multimedia and 59.97 for authentic materials. It indicated that the initial ability of the authentic materials group was higher than the authentic materials through the multimedia group. Therefore, the mean score of the post-test was 73.80 for the authentic materials through multimedia group and 70.83 for the authentic materials group. It showed that the result of the authentic materials through the multimedia group was better than the authentic materials group. The conclusion of this study is the use of authentic materials through multimedia is very effective to enhance students' vocabulary knowledge. [The page range (p1-16) on the .pdf is incorrect. The correct page range for this article is p85-101. The total number of pages (17) on the journal's Table of Contents (TOC) is incorrect. The correct total number of pages for this article (.pdf) is 16.]