The purpose of the article is to classify samples of oral non-fabulous prose recorded by I. I. Popov, based on a generally accepted comparative approach. The material for the study was the manuscript notebook “Old legends of the Don Kalmyks in the original Kalmyk texts and Russian translation” from the collection of Don Kalmyks folklore collector I. I. Popov. Results. The thematic classification of samples of oral non-fabulous prose of Don Kalmyks has the following structure: six myths (five etiological myths about the origin and features of animals, birds, insects, plants, nature phenomena and one calendar myth), seven stories (two of religious content and four — historical), two legends about the origin of customs, rites, rituals and one sample could not be classified as it is incomplete. Hence, out of seventeen samples — nine (No. 3, 4, 5a, 6, 7, 8, 11, 12, 13) do not have any variations and some of them are included into the collections “Seven Stars” and “Myths, Legends and Traditions of Kalmyks”. There are variations or versions for seven samples (No. 1, 2, 5b, 9, 10, 14, 15); however, it should be noted that some samples have not been published in I. I. Popov’s recordings, and are published in the recordings of other collectors. One sample (No. 16) is not classified, thus, there are certain difficulties in the analysis of its variants or versions.