This thesis analyses the issue of administrative inactivity in the context of administrative silence. The institute of legal protection against administrative silence in the Republic of Croatia is being examined. The mechanisms of protection are contained in the General Administrative Procedure Act and the Administrative Disputes Act, as well as in many other laws regulating specific administrative areas. Protection is also guaranteed by the Constitution of the Republic of Croatia and the legal standards set by the European Union. The thesis analyzes and describes the appeal to a higher authority, legal fictions, the initiation of administrative disputes, and compares the legislative solutions of the Croatian legal system with those found in comparative law. Special attention is given to the General Administrative Procedure Act and the Administrative Disputes Act, which contain the foundations for the actions and protection of parties when faced with a situation such as administrative silence. The aim of this research is to highlight the legal actions an individual can take when confronted with administrative silence, as well as what they can expect from the competent institutions and courts.