Child marriage, defined as a formal marriage or informal union before age 18, is a global issue impacting the lives of millions of girls each year and hindering progress towards development the world over. Globally, more than 700 million girls and women alive today were married as children. More than one in three of these (about 250 million) entered into union before age 15. This report to the Italian Agency for Development Cooperation covers the period of 2015 to 2017.