Sierritasuchus is an extinct genus of aetosaur in the subfamily Desmatosuchinae. It is known from a small holotype skeleton from the Late Triassic Tecovas Formation of Texas. This skeleton (known as UMMP V60817) was discovered in 1939 and was originally assigned to the genus Desmatosuchus. It was placed in its own genus in 2008 after having been in the collections of the , with the type species being S. macalpini. The generic name refers to Sierrita de la Cruz Creek where the holotype was found, and the specific name refers to , who discovered the skeleton. Based on the histology of the scutes of the holotype, the individual was a subadult that was not fully grown.