The aim of this thesis is a thorough analysis of the criminal act of computer fraud inside the legal system of the Republic of Croatia. In the introductory section of this thesis, we will explore the legal concept of the criminal act of computer fraud, as well as current circumstances surrounding the perpetration of this act. The reader will be further introduced to the theme through the listing and explanation of key, relevant terms and postulations necessary for a more detailed analysis of the theme. The thesis will then focus on a comprehensive examination of the modern emergent forms of computer fraud, which will include descriptions of said forms. Along with the forms, this thesis will examine the codification on the issues of computer fraud, by way of a short historical view of those codifications and an examination of the current positive law codification in Article 271 of the Penal Code of the Republic of Croatia. Lastly, an overview of selected jurisprudence of the Republic of Croatia’s courts will be presented, together with a look at statistical data from the Croatian Bureau of Statistics, with a summary synthesis of the thesis in the conclusion at the very end.