As banking consolidation proceeds and Europe moves toward a single market, cross-country differences in banking efficiency can affect the future competitive position of a country’s financial market, helping to determine which European money centers may expand or contract. Looking at large banks across 10 countries, we find they are roughly equally efficient after controlling for differences in business environment, banking costs, and bank productivity. As no country seems to have a strong efficiency advantage, it seems likely that state efforts to promote “national champions” through favorable mergers which expand scale and market share may determine the outcome.