This paper explores the effect of banking market structure on the market structure of industrial sectors. It asks whether concentration in the banking market promotes the formation of industries constituted by a few, large rms, or rather, whether it facilitates the continuous entry of new rms, thus maintaining unconcentrated market structures across industries. Theoretical arguments could be made to support either hypotethical scenario. Empirical evidence is derived from a sample of 35 manufacturing industries in 17 OECD countries, adopting a methodology that allows controlling for other determinants of industry market structure common across industries or across countries. Bank concentration is found to enhance industries' market concentration, especially in sectors highly dependent on external nance. Such effect is however weaker in countries characterized by higher overall financial development.