Nandita Artamevia Putri Satrimo. K2220059. Consultant : Drs. Martono,M.A. EXPLORING TEACHER COGNITION IN PRONUNCIATION TEACHING: A CASE STUDY AT THE SENIOR HIGH SCHOOL LEVEL. Thesis, Surakarta : Teacher Training and Education Faculty of Universitas Sebelas Maret, Maret 2025. This study aims to (1) explore teachers' cognition regarding pronunciation teaching and (2) analyze the strategies employed by teachers in teaching pronunciation at the senior high school level. The research was a qualitative case study involving two English teachers from SMA Negeri 1 Boyolali. Data were collected through classroom observations, interviews, questionnaires, and documentations. The central issue identified was the significant influence of teachers' cognitive processes encompassing their knowledge, expectations, viewpoints,intellection,past experiences,and beliefs on their pronunciation teaching practices. The research focused on two English teachers at Senior High School in Boyolali, who were selected based on their direct experience in teaching pronunciation in an English as a Foreign Language (EFL) context. The findings of this study revealed that: 1) Teachers employed various strategies, including the drilling method, multimedia-based learning to enhance students' pronunciation skills. 2) Challenges faced by teachers included students' lack of confidence, limited exposure to English outside the classroom, and pronunciation difficulties influenced by their native language. There is a persistent gap between teachers' beliefs about the importance of pronunciation instruction and their actual classroom practices, particularly in EFL contexts. The findings underscore the importance of understanding teacher cognition in pronunciation instruction and highlight the need for effective strategies that provide to students' diverse learning styles and motivations.