In this study, we explore teachers' professional space as an alternative to, and/or expansion of earlier conceptualizations of teacher autonomy. Professional space is here understood both as an objective space with e.g., physical, juridical, economic features, and as the teachers' subjective negotiation of this objective space, where teachers are viewed as producers of professional space (subjective space). Based on an analysis of storyline interviews with teachers from Finland, Norway and the US we argue that professional space, both as an empirical entity and as a theoretical construct, opens up exploration of external and internal factors, as well as the multi-dimensionality of the factors over time and beyond physical space which influence teachers' decision-making capabilities.