All the Ginis you ever wanted!  
This dataset includes combined and harmonized Gini data from seven original sources: Luxembourg Income Study (LIS), Socio-Economic Database for Latin America (SEDLAC), Survey of Living Conditions (SILC) by Eurostat, World Income Distribution ( WYD; the full data set is available here), World Bank Europe and Central Asia dataset, World Institute for Development Research (WIDER), and World Bank Povcal.

There are almost 3000 Gini values, out of which 1885 are consistent Ginis from 164 countries and covering the period from 1950 to 2011. They are  presented with key dummy variables, adjusting for the type of welfare aggregate used (net/gross, income/expenditure) and recipient unit (household/individual).

This is probably the largest consistent Gini database. Before using it, please read the Description of the dataset document, below: