This research paper focuses on the borrowings in the terminology systems of petroleum engineering in the English and Uzbek languages. The article examines the principles of formation and use of technical lexemes in the professional discourse of the oil and gas industry, including active participation of syntax and word-building resources of each language, translation of terms, and unification of achievements of general scientific and professional fields. Besides, we made analysis in the various aspects of borrowing such as the linguistic nature, causes, types and methods, ways of penetration of borrowed words, sources, and chronology of borrowing. The research employs transliteration and qualitative and quantitative analysis to identify the features of borrowed terms by their morphological, lexical, and semantic points of view. The findings illustrate that some terms in the Uzbek language were borrowed from English, Russian, while in English, loaned from other languages as well.