The article reports on the discovery of Keller’s broomrape (Orobanche kelleri Novopokr., Orobanchaceae) in the Saratov region, a species with a fairly extensive range but extremely sporadic occurrence. Information on the distribution of the species in Europe and Central Asia is provided. The nearest known occurrences of this species are from the Rostov and Volgograd regions. O. kelleri is included in the Red Book of the Volgograd region with category 3g – a rare species with a significant overall range, but located within the Volgograd region at the edge of its distribution. The plants were collected by employees of the Educational and Scientifi c Center ‘Botanical Garden’ of SSU in 2006 in the Krasnoarmeysky District of the Saratov Region in a chalk steppe area near the village of Belogorskoye. The specimens are kept in the Herbarium of the Botanical Garden of Saratov State University (SARBG, Saratov). The morphological features of this species and its differences from related species are discussed, as well as the morphological descriptions of the species made by different authors are compared. The need for further search for new populations of O. kelleri in the Saratov region, as well as the determination of their abundance and the association of plants of this species with certain ecotopes and host plants, is justified.