Teachers are expected to accommodate an increasingly heterogeneous student population. However, teachers often feel ill prepared and, hence, may be apprehensive toward the inclusion of students with special education needs (SEN) in regular classrooms. This paper concerns factors associated with the successful implementation of inclusive education. More specifically, it considers teacher characteristics that may facilitate--or hinder--the inclusion of students with SEN. The paper first discusses teacher competencies concerning the accommodation of students with SEN in regular classrooms, not only as a determinant of effective inclusive practice, but also in relation to teacher attitudes toward inclusive education. Second, we investigate to what extent teachers' attitudes, both toward students with SEN and inclusive education, may affect teaching behaviors and (positive) action toward students with SEN. The paper further discusses (training) methods that could be applied to increase teacher competence and foster positive attitudes in an attempt to strive to a more equitable educational system.