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In this paper, we present the ectothermic vertebrate fauna from the late Middle Miocene locality Gratkorn (Austria). In total, 2 fish, 8 amphibian and 17 reptile taxa have been described. Among them reptiles are the most abundant group. Fish remains are very rare and comprise only small-sized cyprinids (Leuciscinae indet.) and gobiids (Gobiidae indet.). Caudates are represented by a small-sized newt (Triturus sp. aff. T. vulgaris), a salamander (Salamandra sansaniensis), and a crocodile newt (Chelotriton aff. paradoxus). Anurans are documented by Rana sp., Pelophylax sp., Latonia sp., Bufotes cf. viridis, and Pelobates sanchizi. The most diverse and numerous ectothermic vertebrate group are scincomorph reptiles (lizards), of which more than 30 bones belonging to six taxa (Scincidae indet., Lacerta s.l. sp. 1-3, Miolacerta tenuis, ?Edlartetia sp.) have been recognised. Gecko remains (Gekkonidae indet.) are rare. Anguimorphs are represented by a large monitor lizard (Varanus sp.) and a small-size species of Ophisaurus spinari. Four snake taxa are present in Gratkorn: two "small-sized colubrins" Colubrinae sp. 1 and sp. 2, a natricine (Natricinae sp.), and a cobra (Naja sp.). Turtles are represented by two aquatic turtles (Clemmydopsis turnauensis, Chelydropsis murchisonae) and two terrestrial tortoises (Testudo cf. steinheimensis, Testudo cf. kalksburgensis). The fauna of amphibians and reptiles of Gratkorn (layer 11b) reflects a variety of habitats, relatively sparsely vegetated floodplain with sandy soils, including short-lived ponds, streams or rivulets in the close vicinity, relatively open landscapes, with a dry, semi-arid climate (MAP 486 +/- 252 mm).