The purpose of this work is to analyze and compare five novels of the diary discourse of Croatian literature for children and young people, created in a span of about seventy years, from the end of the thirties of the 20th century to the beginning of the 21st century. The novels that will be analyzed are: Sedmi be (1939) by Joža Horvat, Dnevnik malog Perice (1942) by Vjekoslav Majer, Pokušaj zaboraviti (1996) by Miro Gavran, Dnevnik Pauline P. (2000) by Sanja Polak and Dnevnik jedne ljubavi (2007) by Silvija Šesto Stipaničić and Ratko Bjelčić. In the first part of the work, autobiographical prose is treated theoretically, the basic characteristics of autobiographical prose are presented, the possible relationships of author, character and narrator (autobiographical contract) are problematized, and possible discursive types of autobiography are analyzed. The development of autobiography in Croatian literature for children and young people from the 1930s to today is presented. The most memorable works of that period are listed and the reason for the low publication of autobiographical and diary prose is questioned. The five selected works are presented in the order in which they were published, which provides an insight into the development of daily discourse in Croatian literature for children and young people. Attention in the considerations of the selected novels is focused on the basic semantic and stylistic determinants of the daily discourse, on the thematic features of the novel as well as on the relationship between the author, the character and the narrator. Attention is also paid to the events that are worthy of a diary entry, which initiate the action, as well as to the characters who write the diary entries, but also to some minor characters that the subjects of the diary mention, and are essential to the plot of the novel. Also, attention is paid to the time in which the work was written, the time span and the marking of that time in daily prose.