Whereas Isaiah Berlin argued that positive liberty is not a theory of liberty at all, and that negative liberty is the only true conception of liberty, Dorothy Roberts argues that positive liberty is the only true conception of liberty, and that negative liberty is not a theory of liberty at all but rather a theory of power and privilege. This essay takes up that contrast with specific reference to disability. One could argue that disability takes a negative liberty view, because disabled persons are constrained by physical, legal, and attitudinal barriers from doing many things they want. But this requires a positive liberty gesture of expanding what we mean by “barriers,” such as seeing stairs as a barrier rather than a natural part of building architecture for which nobody is responsible. But this essay carries the positive liberty argument further, drawing on feminist insights about the social construction of desire and subjectivity, to argue that positive liberty is important to a full understanding of freedom for disabled persons.