Transylvanosaurus (meaning "lizard from across the forest") is an extinct genus of rhabdodontid ornithopod dinosaur from the Late Cretaceous (Maastrichtian) Hateg Basin of Romania.

[1] The holotype specimen, LPB (FGGUB) R.2070, was found in 2007 in the ‘Pui Beds’ in the Bărbat River Valley section of Haţeg Basin, Hunedoara County, Romania.

[1] In 2022, Transylvanosaurus platycephalus was described as a new genus and species of rhabdodontid ornithopod dinosaurs by Felix J. Augustin, Dylan Bastiaans, Mihai D. Dumbravă, and Zoltán Csiki-Sava based on these remains.

The generic name references Transylvania, the region that contains the type locality of the genus in the Haţeg Basin .

[1] Muttaburrasaurus Rhabdodon Transylvanosaurus Mochlodon vorosi Mochlodon suessi Zalmoxes shqiperorum Zalmoxes robustus Despite these results, Augustin et al. propose "particularly close relationships" with Rhabdodon based on morphological comparisons.