The expansion of international trade and global business competition in recent years has been accompanied by growth in corruption. While many factors may contribute to a person's willingness to participate in a corrupt transaction, the influence of religion may be significant, and leaders of religious organizations have become increasingly vocal in their condemnation of corruption. As honesty and fairness to third parties is universal to many religions, leaders of many faiths are united in their opposition to corruption. To better comprehend (...) the relationship between religion and corruption, a study was conducted employing information related to religion and Transparency International's Corruption Perceptions Index (CPI), which ranks nations according to the perceived degree of corruption among public officials and politicians. The 133 countries that were included in the 2003 CPI were compared across a range of factors related to 1) the dominant religion practiced in each country, 2) perceived corruption, 3) the importance of religion to the citizens of each country, 4) religious freedom, and 5) the gross domestic product (GDP) per capita. Study results indicate that, when countries are grouped by dominant religion, the groups differ significantly with regard to perceived corruption, value of religion, religious freedom, and GDP per capita. Significant differences in the same factors also occurred when countries were grouped by corruption levels. (shrink)