This paper reports a phenomenographic study exploring diverse understandings and experiences of teacher leadership among 12 members of the International Study of Teacher Leadership research team comprised of 20 academics located in 10 countries. Mind mapping and semi-structured, online interviews were used to explore the ways that the participants related with the phenomenon of interest: 'teacher leadership'. Phenomenographic analysis of interview artefacts revealed nine qualitatively different conceptions of teacher leadership in the study's outcome space across three broad domains: A: The school, school community and formal education system; B: The teacher leader's professional self; C: The broader historical, socio-political and global contexts of teacher leadership. In addition to providing a 'touchstone' for the team's ongoing research, these findings serve as an experiential framework for thinking about teacher leadership, potentially encouraging more inclusive, more complete and richer understandings of the phenomenon.