Irajatherium is an extinct genus of cynodonts, known only of the type species Irajatherium hernandezi. It is named in honor of Irajá Damiani Pinto.

Irajatherium hernandezi is a species known only by a humerus, a femur, two jaws and an upper arch incomplete, has the upper canine teeth after pills across and the post-mandibular canines with a more developed central cusp, followed by three smaller ones. It was collected in the Candelária Formation in the municipality of Faxinal do Soturno in the Paraná Basin of southeastern Brazil.