This paper distinguishes between the concepts of justification and legitimation with a view to offering a normative standard for global justice compatible with cultural pluralism. According to this distinction, justification is presented as an idealized, substantive and top-down enterprise rooted in the moral and metaphysical substrate of a specific culture. On the other hand, legitimation has a procedural and factual connotation and derives its strength from the success of some culturally independent but historically situated practice (bottom-up approach). Building on this distinction, I argue that justification and legitimation should be made complementary for the sake of cross-cultural dialogue.