This study examines the communities of the protected Carabus hungaricus Fabricius, 1792 (Coleoptera: Carabidae), in Bulgaria. With the help of 252 pitfall traps, in the period of 24 May 2021 – 10 December 2023, we surveyed 42 sample plots in central-western Bulgaria. Carabus hungaricus was established in seven of the sampling sites (frequency of occurrence, F = 17%), with a total of 198 specimens (1.3% of the total numbers of the carabids). In these seven sites, we found 57 species belonging to 23 genera and 12 tribes, mostly open habitat dwellers. Tribe Harpalini had 19 of the species (33%). The most species-rich genera were Harpalus (13 sp., 23% of all), Amara (8 sp., 14%), and Carabus (6 sp., 10%). The most represented species were the superdominant Calathus distinguendus (with more than 71% of all carabid specimens), the dominants Carabus coriaceus and Laemostenus terricola, and the subdominants Calathus cinctus, Carabus cavernosus, C. hungaricus, and C. convexus. Euconstant species, collected in all seven sampling sites (F = 100%), were C. coriaceus and Calathus distinguendus. Among the common and abundant members of the C. hungaricus communities in Bulgaria were the constant species, found in six or five of the sites (F = 86%, F = 71%): Calathus cinctus, Laemostenus terricola, C. cavernosus, C. convexus, Cymindis axillaris, and Licinus cassideus. In terms of the ecological relationships of C. hungaricus, possible competition might be expected from the closely related species C. morio, insofar as they have very similar ecological requirements, and to some extent from C. torosus, which is more xerophilous. However, they do not occur in the area where C. hungaricus lives in Bulgaria. Carabus scabriusculus seems to occupy a different ecological niche, and has a wider tolerance in its requirements; in addition, in recent decades, in Bulgaria this species has seemed to decline more and more.