This paper presents terms related to the implementation of a special administrative procedure for the entry of citizens of third countries into the Republic of Croatia. It is explained what the monitoring of the state border entails, how border control is performed, and how the state border is protected. Furthermore, the paper explains in which cases third-country nationals will be refused entry to the country. The term visa is defined, and which body is responsible for issuing it. It also highlights what happens in cases where a visa is issued at a border crossing and when a request for a so-called short-term visa can be rejected. The paper explains the ban on the entry and stay of a citizen of a third country and the case of illegal entry of a citizen of a third country into the Republic of Croatia. The decision on return as well as the decision on expulsion is analyzed. The paper explains in which cases citizens of third countries are accommodated in a center for foreigners, what are the options for milder measures than accommodation in a center, what are the reasons for accommodation in a center, when accommodation is extended, how the accommodation of minors and families in the center is arranged, and the stricter police supervision.