Liberalism, historically, is closely associated with increased toleration, so it is unsurprising that a variety of contemporary authors (Hampton, Kukathas, Barry, Ten) consider toleration to be “the substantive heart of liberalism” (Hampton 1989, 802). The precise role of toleration in liberalism, though, is unclear; different liberals have different views. In this essay, I will discuss three sorts of liberal theories and indicate how they approach questions of toleration, arguing that one of them supports toleration of more sorts of activities (including speech acts and lifestyles) than the others. While I think this is reason to favor that sort of theory, I will not defend that claim. Some reasonably think (and defend the view) that thoug...