This study is aimed at describing profiles of interpersonal behavior of Indonesian mathematics teachers and examining associations between students’ perceptions of their mathematics teachers’ interpersonal behavior and their motivation in learning mathematics. Data were collected with the Indonesian version of the Questionnaire on Teacher Interaction (QTI) and the Questionnaire on Motivational Dimensions. The framework of this study is based on the Model of Interpersonal Behavior that maps teachers’ conduct in terms of 2 dimensions: Influence (Dominance–Submission) and Proximity (Cooperation–Opposition). A total of 506 students (grades 7 to 9) from 16 classes in 5 public secondary schools in the West Java and Jambi provinces, Indonesia, par...