By using stochastic frontier analysis, this article examines the technical efficiency of different types of microfinance institutions in Latin America. In particular, it tests whether differences in technical efficiency, both intra- and interfirm, can be explained by differences in ownership. With a focus on non-governmental organizations, cooperatives and credit unions, non-bank financial intermediaries, and banks, the data set contains 1681 observations from a panel of 315 institutions operating in 18 Latin American countries. The results show that non-governmental organizations and cooperatives have much lower interfirm and intrafirm technical efficiencies than non-bank financial intermediaries and banks, which indicates the importance of ownership type for technical efficiency. (C) 2012 Elsevier B.V. All rights reserved.