The theme of the dissertation is the constitutional position and authority of the Croatian President. The paper is divided into five themes. The first part is about the Croatian President and his position. The second part is about the election process for the President of the Republic of Croatia. From nomination to the election, and about the institutions responsible for carrying out the election. It describes what their tasks are. The third part of the paper names and explains the authority of the President of the Republic of Croatia in national politics. This section explains the call for elections to the Croatian Parliament and the convocation of the first session, in which case the Croatian Parliament can have an extraordinary session, giving the mandate for assembling the Government, and making decision of the appointment of the Prime Minister. It describes when a temporary non-partisan government can be proclaimed, in which cases the Croatian Parliament could be dismissed, the announcement of referendum and in what occasion amnesties, medal of honour and awards may be given. The fourth part is about the authority of the President in of foreign affairs, and the fifth part shows the authority of the President in national politics.