The constitutional right to privacy is a doctrinal mess. The United States Supreme Court appears incapable of articulating a coherent underpinning to this important line of cases, or--more likely--is simply unwilling to do so. And yet there is an obvious candidate for that job: the philosophy of liberalism. But liberalism is a notoriously complicated and contested philosophy. Thus, this Article proposes a succinct and functional articulation of liberalism, which it then applies to Supreme Court cases dealing with the right to privacy. As we shall see, the Court's failure to follow liberal principles lies at the heart of its inconsistencies. Greater understanding of liberalism, and greater willingness to respect this political theory so deeply rooted in American history and tradition, could bring much needed coherence to this body of constitutional law.