An Analysis of Students' Speaking Anxiety in English Classroom at 2nd Grade of SMAN 1 Panyabungan. To speak in foreign language, students certainly will experience various obstacle. One of the barriers is from psycological aspect, which is anxiety. This study is aim at analyze the level of students speaking anxiety in English classroom and to find out the factors cause students' speaking anxiety. This study was conducted at SMAN 1 Panyabungan. The subject of this study is XI IPS 2 class of SMAN 1 Panyabungan. To collect the data, the researcher used questionnaire and interview as the instrument. Questionnaire used is FLCAS (Foreign Language Classroom Anxiety Scale) develope by Hortwiz which consist of 33 items with 5 point Likert-Scale. The result of this study showed that most of the students are at "Moderately High Anxiety" level. There are 5 students (18%) who experience "High Anxiety" level, '11 students (36%) are in "Moderately High Anxiety" level, 4 students (13%) have "Moderate Anxiety" level, 6 students (20%) are in "Moderately Anxiety" level, and 4 students (13%) have "very Low Anxiety" level. This research also showed that speaking in front of the class, being laughed at by others, incomprehensible input, students' beliefs about language learning, teacher personality, and lack of preparation were the six factors that may contribute to the students' anxiety in learning English from ten anxious students were selected as the participants.