Calosoma janssensi is a species of ground beetle in the subfamily of Carabinae. It was described by Pierre Basilewsky in 1953. This species is found in the Democratic Republic of Congo.
Adults reach a length of 26-30 mm and are brachypterous.
This species is treated as a subspecies of Calosoma oberthueri by some authors.
The species is named for Belgian entomologist André Janssens.