Nopcsaspondylus (meaning "Nopcsa's vertebra", in reference to the original describer) is a genus of rebbachisaurid sauropod dinosaur (a type of large, long-necked quadrupedal herbivorous dinosaur) from the Cenomanian-age (Upper Cretaceous) Candeleros Formation of Neuquén, Argentina.

The first person known to study the specimen, Hungarian paleontologist Franz Nopcsa von Felső-Szilvás, described it in a 1902 publication and recognized it as belonging to a sauropod dinosaur, assigning it to the genus Bothriospondylus.

[1] A year later, American paleontologist John Bell Hatcher claimed that this vertebra was indistinguishable from those of Haplocanthosaurus, a sauropod known from Colorado, and that while the Argentine vertebra does not undoubtedly represent the same genus as the Colorado material, the two are very similar in structure.

[2] The vertebra would next be studied by German paleontologist Friedrich von Huene, who wrote a monograph published in 1929 in which he reassigns the material to the species Titanosaurus australis, and the locality from which it originates is named as Alarcón for the first time.

[4] Five years afterwards, Argentine paleontologists Jorge O. Calvo and Leonardo Salgado described a new species which they named Rebbachisaurus tessonei (currently moved to the genus Limaysaurus), the specimens of which originate from the same locality (now named as Barda Alarcón) as the vertebra first described by Nopcsa 93 years prior.