The issues of translation theory and practice are of great interest in Lithuania as well as in other countries. Researches on translation theory and practice have become even more relevant for Lithuania with its joining the European Union (EU). The aim of the research is to discuss the issue of eurojargon (specific formal language used in the EU institutions) in the aspect of translation. The paper presents theoretical background on this EU language, along with a detailed overview of its concept, major conflicts and differences on it, and its characteristics. This master’s final paper presents a lot of EU terms and their Lithuanian translation equivalents illustrating translation problems, which are encountered when translating the EU documents, and the influence of eurojargon on the Lithuanian language. It also presents the analysis of 700 English-Lithuanian EU terms within the framework of the theory of linguistic relativity. The paper presents an investigation, its results, and the reasons for informants’ incorrect translation.