Katepensaurus ("hole lizard") is an extinct genus of rebbachisaurid sauropod dinosaur known from the Late Cretaceous of south-central Chubut Province of central Patagonia, Argentina.

[5] The only known specimen of Katepensaurus goicoecheai was collected from the "2005 Quarry" at Estancia Laguna Palacios, a ranch owner at which the National University of the Patagonia San Juan Bosco regularly conducted field work.

In 2013, Lucio M. Ibiricu, Gabriel A. Casal, Rubén Dario Martínez, Matthew C. Lamanna, Marcelo Luna and Leonardo Salgado described this specimen as representing a new genus and species, which they named Katepensaurus goicoecheai.

In Katepensaurus, the lateral pneumatic fossae of the dorsal vertebrae were divided in two by a ridge of bone, which is an uncommon trait among sauropods not known in other rebbachisaurids but present in the more distantly related Supersaurus.

[1] Katepensaurus is unique among sauropods in exhibiting an additional set of pneumatic openings, termed laterodiapophyseal fenestrae, through which air sacs would have filled the transverse processes of the dorsal vertebrae.