This study aimed to analyze the level of inequality of economic development of the region in Sleman district Williamson Index analysis tools, Entrophy Theil index, and true or false test hypotheses about the Kuznets inverted U curve applies in Sleman. The study was conducted in 17 districts in Sleman. Data used in this study a method of secondary data obtained from related parties. The variable used is the GDP, economic growth, population, and the GDP per capita. Inequality economic area in Sleman district in the 2010-2014 period based on the index of inequality is relatively high. And the relationship between economic growth and inequality indexes are index Entrophy Williamsom and Theil index, shows the inverted U shape. This means that the Kuznets hypothesis can be said to apply in Sleman in the period 2010 - 2014.