This study was 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 Relative Autonomy Scales (RAS). The framework of this study was based on the Model of Interpersonal Behaviour (MITB) that maps teacher conducts in terms of two dimensions: Influence (Dominance-Submission) and Proximity (Cooperation-Opposition). A total of 506 students (grade 7 to 9) from 16 classes in 5 public secondary schools in West Java and Jambi provinces, Indonesia, participate...