Spinosaurus mirabilis is a large extinct species of the spinosaurid theropod dinosaur genus Spinosaurus, known from the Late Cretaceous Farak Formation of Niger. The species was named and described in 2026, based on various cranial and postcranial bones collected in two localities. It is characterized by a long, low snout, a scimitar-shaped midline crest on the top of the skull, and a large sail over the back.