Contemporary Catholic magisterial documents frequently use of the word ‘dignity’ to describe the institution of marriage. In this chapter, I argue that the language of dignity is meant and should be taken here quite seriously; ‘dignity’ is predicated of marriage by analogy with its predication of persons, but not merely by a metaphorical extension. We are meant to understand some quite specific points about marriage by the language of dignity, as to its nature, its origins, its end, and its role in ethical and political life.