The diploma thesis entitled "Catholic children's literature of the 1930s and the canon of Croatian children's literature" investigates Catholic children's literature and children's literary canons in Croatia during the 1930s, with an emphasis on children's Catholic magazines of that period. The paper is divided into two parts: the first focuses on the characteristics of Catholic and children's literature and their mutual relationship, while the second analyzes the significance of magazines such as "Guardian Angel", "Youth," "Kindergarten," and "Black ones". These magazines played a key role in the development of Catholic children's literature and were an important tool for the upbringing and education of children. The paper emphasizes the need to review the literary canon because the Catholic literature of that time is not sufficiently represented despite its rich production. Although some contributions from the magazine do not have significant aesthetic value, they represent an important reflection of tendencies in children's literature. The research suggests that the inclusion of lesser-known authors and their works could enrich the canon of Croatian children's literature.