Amidst societal, demographic and educational changes, teachers are expected to engage in professional development and learning (PDL) throughout their careers. This study explores school teachers’ mental models about their work in the framework of Senge’s learning organisation, aiming to support their PDL during curriculum reform and organisational changes. The study’s data comprise 41 semi-structured interviews with each teacher in one school community. These interviews were analysed using qualitative, data-driven yet theory-informed content analysis. In the first analysis phase, fragments of mental models concerning teachers’ work and their school community were explored. These fragments included themes such as school rules, principal’s role and working with colleagues. The findings show that the teachers’ mental models regarding their work and school community can be characterised as contradictory and even opposite. In the second phase, these fragments were brought together to form a systemic, holistic picture of the school community, consisting of mental models on system management, teaching community, classroom, students and leadership. Finally, the teachers’ mental models are discussed vis-à-vis their importance in individually and socially supporting teachers’ PDL when the school community is undergoing diverse changes.