Abstract
The link between federalism and the EU has been widely explored from the perspective of structural, definitional elements. Rather than looking at the impact of federalism on the EU, this paper looks at what the EU tells us about contemporary federalism. It is contended that the most significant contribution of the EU to the theory and practice of federalism is the key role of asymmetry. In the EU, like in other contemporary manifestations of federalism, asymmetry is the backbone of the functioning of the relations between the tiers of government, a structural rather than an accidental element of today’s federalism.