We draw on institutional theory and interviews with key informants to assess international accounting harmonization in the 13 countries of the Group of Latin American Accounting Standards Setters (GLASS). Some GLASS countries have effected full formal adoption of International Financial Reporting Standards (IFRS), but in others, IFRS are not permitted. In several GLASS countries, IFRS are supplemented by national standards for micro-entities and cooperatives. We conclude that it will be difficult to achieve material harmonization in GLASS countries due to a lack of trained accountants, unreliable enforcement systems, and competing institutional logics of taxation systems, banks and insurance companies.