Flanders experienced large inflows of immigrants over the past decade, coming from an increasingly diverse range of countries, with growth rates outpacing the Netherlands, France and Germany, as well as Belgium as a whole. While integration outcomes have improved in recent years, some of the core indicators remain unfavourable in international comparison, especially for non-EU immigrant women, refugees, and youth with migrant parents. Against this backdrop, Flanders has developed a comprehensive integration policy. This review, the fourth in the series Working Together for Integration, provides an in-depth analysis of the Flemish integration system, highlighting its strengths, weaknesses, and potential areas for improvement. Earlier reviews in this series looked at integration in Sweden (2016), Finland (2018) and Norway (2022).