|Named By:||B. F. Nopcsa in 1903|
|Time Period:||Late Cretaceous, 70 Ma|
|Location:||Romania - Transylvania - Sanpetru Formation|
|Size:||Around 5 meters long|
|Classification:||| Chordata | Reptilia | Dinosauria | Ornithischia | Ornithopoda | Hadrosauridae ||
|Also known as:||| Hecatasaurus | Limnosaurus transsylvanicus ||
Telmatosaurus (meaning "marsh lizard") is a genus of basal hadrosaurid dinosaur from the Late Cretaceous. It was a relatively small hadrosaur, approximately five meters (16 ft) long, found in what is now Romania.