The subject of this thesis is translating jargonisms to Croatian language, based on translations of literary works originally written in the Bulgarian and Macedonian language. The introduction of the thesis presents the general theoretical aspect of jargon, its definition and features, and gives a few examples of jargonisms in South Slavic languages. The translation theories and their approach to translating and particular translation solutions are presented in the following chapter. The analysis is based on studying the chosen corpus of literary works in Bulgarian and Macedonian and their translations to Croatian. By comparing the original works and their translations, with special focus on translating jargonisms, the given translations are critically reviewed and reasoned. The theoretical part also presents some translatological theories which explain the particular translation solutions. Each claim about a particular translation is accompanied by an example of it, which consists of a part of an original text and its translation to Croatian. Also, the typology of translation solutions in the analysis is given previously. The analysis is based on examples from the novel Decay (Разруха) by Vladimir Zarev, originally in Bulgarian language and from the short story collection My Husband (Мојот маж) by Rumena Bužarovska, originally written in Macedonian. The conclusion consists of summarizing the previous analysis and contains the author’s personal opinion on the translations and their relevance.