The subject matter of the thesis focuses on the rights of Third country workers in the Republic of Croatia. The text of the thesis contains a detailed assessment of all rights of Third country workers in the Republic of Croatia, conditions for granting residence and work permits, employment conditions, as well as social rights that are realised upon employment and residence in the Republic of Croatia. The fundamental source of information is the Aliens Act prescribing rights and obligations of foreign workers asserted by their employment, as well as rights to legal protection in terms of the occurrence of certain court proceedings. At the same time, a variety of international conventions and regulations which at the time formed the legal basis of the Aliens Act that is currently in force, have also been considered. In conclusion, the need for the employment of Third country workers had been increasing over time, while at the same time the annual employment rates for the employment of foreign nationals, determined by the government of the Republic of Croatia, are also increasing. Despite the above-mentioned, and on the basis of the analysis of Eurostat data, the Republic of Croatia has a relatively low employment rate of Third country workers as compared to some more developed countries of the European Union.