This master's thesis investigates the way children were educated in the spirit of socialist patriotism in Socialist Yugoslavia. It researches into the way this education was implemented on grassroots level in two different institutions: Pioneer City in Zagreb and Pioneer House in Sisak, which were founded to help implement planned education of young pioneers to make them new socialist citizens. Pioneer City in Zagreb, founded and built right after the end of World War Two, functioned as an experimental elementary school where the best young pioneers spent half of the academic year and where teachers were supposed to create and test the best educational techniques. After that, those techniques were supposed to be promoted among the teachers from all over the country at seminars organized for them in the City. Pioneer House in Sisak was built during the 1960s, when the situation in the country was different, which made education in this institution more varied. Unlike Pioneer City, Pioneer House was founded as an institution for organizing young pioneers’ free time through various lectures, theatre plays, competitions, manifestations, literary sections and workshops. Fun was an important aspect of all those activities, but they and the children’s magazine Kurir published by Pioneer House reveal that the education in those institutions was swamped with ideology. It was based on promoting five pillars which the Yugoslav socialist society rested on: Josip Broz Tito’s personality cult, brotherhood and unity, national liberation struggle, self-management and the Non-Aligned Movement.