The subject of the study of this paper are hybrid threats to the security of the Republic of Serbia, and they have been examined by the following elementary contents: the concept and characteristics of hybrid threats, the threat to the security of the Republic of Serbia by hybrid threats and hybrid threats countering. The objective of the research was to determine what hybrid threats are, how they affect the security of the Republic of Serbia, and which methods and measures should be taken to counter these threats. The results of the research have shown that hybrid threats are not a new phenomenon, that the security of the Republic of Serbia has already been threatened by hybrid threats, and that they will threaten its security in the futur...