The phenomenon of due process paranoia is a real and growing problem in international arbitration. It potentially exacerbates the trend of rising costs and delays in international arbitration, undermines the significance of due process, and reinforces the erroneous conception that the goals of due process and efficiency are inherently opposed. It overlooks the fact that the concept of due process in international arbitration has been carefully calibrated so that it refrains from absolutism and contains a window through which considerations of efficiency can properly feature. Perhaps most significantly, due process paranoia compounds the problems of the rapidly growing complexity of disputes and the inertia that has slowed the reform of longstanding procedures that arbitration’s users neither require nor desire. In these ways, due process paranoia threatens the legitimacy of international arbitration.