Global income inequality is currently a much-debated issue. There is a general condemnation of the ever-increasing income inequality in advanced economies and China, while the old rhetoric on the growing income disparities between countries continues to be addressed by international organisations and the media. However, as shown in this paper, the reality is far more complex. Over the last twenty years, and for the first time in three centuries, global income inequality has declined. This finding appears to contradict conventional wisdom, but it is scientifically undeniable since it is backed by three separate studies.