This chapter takes up the daunting question of the Federal Constitutional Court’s legitimacy. It scrutinizes possible bases of such legitimacy, carefully assesses each one, and shows them all to be problematic. The investigation approaches the topic with a three-part distinction. It begins with the legality of the Court and, therefore, the question to what extent the assumption that the Court is bound to law, and merely applies the law, appropriately describes its actual practice. After that it takes a look at the legitimacy of the Court in terms of the factual social acceptance of its decision-making practice. Finally, and most extensively, the investigation turns to the normative justification of the Court by asking about good reasons for its present institutional configuration. In a concluding reflection, the chapter examines the interrelation of the above-mentioned elements.