This article examines the nature and extent of similarities and differences in cultural values among managers in the three nations that signed the North American Free Trade Agreement (NAFTA). One component of a culture is ethics, with this aspect of a culture existing as a potentially strong influence on the success of business organizations. In order to explore the impact of culture on ethical decision making in the NAFTA countries, we review the literature and develop propositions concerning the dimensions of culture that would be expected to influence the ethical standards applied to business decisions and organizational practices. The analysis applies Hofstede's [Culture's consequences. Beverly Hills, CA: Sage, 1980.] four cultural dimensions in the three NAFTA countries, which include individualism vs. collectivism, uncertainty avoidance, power distance, and masculinity. We also examine three additional cultural factors - attitude toward work, problem solving, and view of human nature. Propositions are presented involving the prevalence of codes of ethics, issues relating to bribery of public officials, and treatment of low-level employees. Finally, we discuss research design issues relevant for empirical investigation of the propositions. (C) 2002 Elsevier Science Inc. All rights reserved.