In this lecture, Jean-Luc Marion advances a phenomenological notion of sacrifice that is distinct from the notion of sacrifice typically discussed in Sociology or even Religious Studies. He argues that sacrifice restores the gift from the side of the givee, much as he has argued previously that forgiveness restores the gift from the side of the giver. He develops both notions within the framework of a phenomenology of givenness, advancing the thesis that sacrifice requires neither destruction, nor restitution, nor even exchange, and still less contract. Sacrifice surpasses all this because sacrifice does not arise as an economic notion (one that would make an economy of the gift), but rather from the gift itself. The function of sacrifice is only to permit acknowledgment of the giver and thereby the entire process of givenness, by reducing the given.