My aim in this paper is to consider a particular line of criticism that has been used by constructivists to argue against moral realism, which is to claim that if moral realism were true, this would then threaten or undermine our autonomy as agents. I call this the argument from autonomy. I argue that the best way to understand the argument from autonomy is to relate it to the issue of obligatoriness; but that there are a variety of strategies to (...) be explored concerning obligation before it is clear that the right response to this issue is a constructivist one, or that the realist is hereby compelled to surrender their position. (shrink)