The article is devoted to the analysis of foreign-language names of measures in the corpus of 64 published Tuvan heroic tales. The composition of 17 lexical units with orthographic and phonetic variants, as well as with derivatives recorded in the texts, is determined. It was revealed that 6 units are obsolete, 8 are found only in the language of folklore, 3 are not recorded in the lexicographic sources of the Tuvan language and in works on Tuvan lexicology. A significant part of the analyzed lexical units is unknown to modern native speakers. In most cases, the source language and the intermediary language from the Chinese and East Tocharian languages is Mongolian, 4 units are borrowed from the Russian language. The names of measures are divided into five semantic groups: measures of length and distance; measures of fabric; measures of volume; measures of weight and cost; measures of time. It is concluded that foreign language vocabulary in the language of Tuvan folklore requires further study and description by means and methods of linguafolklore studies and linguacultural studies.