Among the Middle Eastern nations, Iran has the highest Gini coefficient value at 40.8%. But Middle East, as a collective region, has relatively lower income inequality levels compared to African, Central American and South American regions.

^*The Gini coefficient, also known as the Gini index or Gini ratio, is a measure of income or wealth inequality within a country. Developed by Italian statistician Corrado Gini, a Gini coefficient of zero implies perfect equality while a value of 1 or 100% expresses maximal inequality. 

^** However, the latest Gini coefficients for the countries are based on different years - as such, the values should be used as a general reference and not an exact comparison.