Authenticity plays key methodological and normative roles for early Heidegger: as he puts it, to ‘work out the question of Being adequately … we must make an entity – the inquirer – transparent in his own Being’. But the precise nature of those roles, and how Heidegger differs from other thinkers of authenticity, is much less clear. This chapter considers three possible interpretations of authenticity found in the contemporary literature. On a transcendental reading, authenticity is what allows us to first recognize reasons as such and act in light of norms at all. On a unity reading, authenticity unifies Dasein’s commitments, and thereby grants a special narrative or judgmental coherence to my life. Finally, on the structural reading, ultimately defended here, authenticity is an inchoate awareness of the structural features of normative space and of Dasein’s own way of being. It is only this interpretation, it is argued, that can make sense of Heidegger’s text and the centrality of authenticity within his early work.