In this study, the purpose was to study what kind of supervision supports inclusive teacherhood the best. Inclusive teacherhood means a teacher's professional development and the school culture's change toward participatory school for all students. The study investigated the perceptions of supervisors with a teaching background. This was a qualitative research in which the data were obtained using the focus-group interview method. The interviews were conducted in five places in Finland. The analysis involved a combination of phenomenography, particularly the application called the variation theory, and the classic analysis of the focus-group research method. According to the findings, supervision that supports inclusive teacherhood can be viewed from two wide perspectives that represent its special features. They are the principles of supervision and the practical execution and special methods of supervision that differ from other mentoring forms. The principles of supervision are awareness of similar methods, careful planning of supervision, regularity, and long-term duration. The special practices of supervision are varied methods, attention to the supervisees' needs, and appreciation of the supervision process. At its best, supervision supports inclusive teacherhood by supporting and empowering teachers' in their work.