Bahariasaurus, which translates to "Bahariya lizard," is a puzzling genus of sizable theropod dinosaur. Within the Bahariasaurus genus, there is at least one identified species, Bahariasaurus ingens, which is traced back to the Late Cretaceous period, specifically the Cenomanian and Turonian ages. Fossils unequivocally attributed to Bahariasaurus have been recovered from the Bahariya Formation in North Africa.

Bahariasaurus is generally considered to be among the most substantial theropods, approaching the stature and dimensions of other massive theropods like Tyrannosaurus rex and its contemporary counterpart, Carcharodontosaurus. These approximations typically place Bahariasaurus at a length of about 11–12 meters (36–39 feet) and a total weight of around 4 tonnes.

Bahariasaurus was among the quartet of massive theropods discovered in the Bahariya Formation. The other three members were the allosauroid Carcharodontosaurus and the spinosaurids Spinosaurus and Sigilmassasaurus. However, there's an ongoing discussion regarding the validity of Sigilmassasaurus, as it may potentially be considered a subordinate synonym of Spinosaurus. It's probable that these predators within the Bahariya Formation practiced niche-partitioning to prevent direct competition, thus allowing them to coexist in the same environment.

A significant question surrounding North African theropod dinosaurs today is whether Deltadromeus and Bahariasaurus are, in fact, the same dinosaur. These two dinosaurs exhibit striking similarities and share the same geological formations. However, comparing Deltadromeus with the original Bahariasaurus fossils is an impossibility due to the destruction of the Bahariasaurus fossils during World War Two, a fate shared with the original remains of the dinosaur Spinosaurus and the giant crocodile Stomatosuchus. As a result, while some entertain the possibility that Deltadromeus might be identical to Bahariasaurus, conclusive evidence to establish this connection remains elusive.