Cultural diversity can put a strain on social cohesion in society. On the one hand, immigrants’ loyalty and commitment to the Netherlands have been questioned in public and political debates. On the other hand, the fact that immigrants occupy relatively disadvantaged socio-economic positions in society has raised concerns about discrimination and inequality. This thesis investigates the psychological integration of immigrants, in other words their sense of national belonging, and asks to what extent economic integration can have a stimulating effect. Four different aspects of immigrants’ psychological integration are studied: intentions to settle permanently in the Netherlands, identification with the Netherlands, generalized and political trust, and attitudes towards natives and the host society. Furthermore, the roles of social contact with natives, cultural integration, and perceived relative deprivation are studied as possible intermediary mechanisms. The analyses in this thesis are based on large-scale survey data, collected among first and second generation immigrants in the Netherlands. The study focuses both on the largest cultural minority groups in the Netherlands – Turks, Moroccans, Surinamese, and Antilleans – and on refugees from Iran, Iraq, Afghanistan, Somalia, and the former Yugoslavia. Furthermore, comparisons are made with a native Dutch reference group in several chapters of the thesis. The data is analyzed through multivariate statistical analyses. The results confirm that economic integration is directly and indirectly related to psychological integration. Economic integration can contribute to identification with the host country, social trust and political trust, and positive attitudes towards the native population. Social contact with natives can partially explain these positive associations. However, economic integration can also be negatively related to psychological integration, because immigrants who are higher educated tend to experience more discrimination and a lack of ...