This study investigated preservice and inservice teachers' perceptions of appropriateness of teacher self-disclosure. A sample of 180 preservice teachers and 135 preK-12 teachers participated in the study. Results showed statistically significant differences between the groups of teachers in their perceptions of appropriateness of teacher self-disclosure in three dimensions. This study makes an excellent contribution to the theoretical framework of the study of teacher self-disclosure and also provides implications for teaching and teacher education.