Education is a fundamental human right and essential to enable people to maximize their abilities to settle in a new country, adapt to a new environment, and become participating community members. As part of the challenges posed by immigration, the society aims to provide at least primary education to the children of immigrants. Statistical data show that in recent years, the number of students from other countries has increased in Slovenia. Slovenian educational institutions are confronted with a larger number of immigrant and refugee children with different cultural and linguistic backgrounds than Slovenian children. In order to explore what the challenges are in integrating immigrant students into Slovenian primary schools, we will try to answer the main research question of what challenges principals face in integrating immigrant children into primary education. This will be researched through an empirical analysis methodologically based on semi-structured interviews with school principals in selected primary schools.