Theses Christian Democracy in the Election Manifestos of the Croatian Democratic Union from 2003 to 2020 analyzes the presence of Christian Democratic political ideology in the election programs of the Croatian Democratic Union (HDZ). The research is based on the morphological approach to the analysis of political ideologies, which determined the central political concepts of the Christian Democratic ideology. According to political theorist Carlo Invernizzi Accetti, these are anti-materialist philosophy of history, personalism, populism, subsidiarity, social capitalism and Christian inspiration. Through the aforementioned political concepts, that is, their empirical indicators, the presence of Christian Democratic ideology in the election programs of the HDZ, a political party that is often associated with Christian Democratic ideas and values, will be investigated for this purpose, a qualitative analysis of the content of the election programs of the mentioned political party from 2003 to 2020 will be conducted, and for the purposes of the analysis, four hypotheses have been set. Analyzing the presence of Christian Democracy in the election programs of the HDZ contributes to the explanation and understanding of the ideological profile of the mentioned party, as well as a better understanding of Christian Democracy as a political ideology that is insufficiently researched in the 21st century.