Human welfare, which is listed as one of the main objectives of the science of economics, requires a fair distribution of income. The GINI coefficient, which reflects income justice, provides an important way to reduce income inequalities and increase human welfare in countries. In this study, the effects of real interest rates, which are important determinants of GINI coefficient, on income inequality in selected OECD countries are examined. According to the Pooled Average Group Estimator (PMG) estimation results, 1 unit increase in real interest rates increases the inequality of income distribution by 0.014 in the long term. The fact that the error term correction coefficient (COINTEQ01) is negative and the probability value is significant indicates that there is a long-term relationship between real interest rates and income distribution injustice.