Nanhsiungoolithus is an oogenus (fossil-egg genus) of dinosaur egg from the late Cretaceous of China.

It belongs to the oofamily Elongatoolithidae, which means that it was probably laid by an oviraptorosaur, though so far no skeletal remains have been discovered in association with Nanhsiungoolithus.

[2] Nanhsiungoolithus eggs were first discovered in Southern China by the pioneering Chinese paleontologist Yang Zhongjian.

In 1965, he described several types of eggs from Nanxiong (Nanhsiung) in Guangdong, including two partial nests that would later be classified in Nanhsiungoolithus.

Zhao chose the oogenus name to honor Nanxiong county, with the specific epithet chuetienensis meaning "from Chuetien", after the town nearest where the fossils were discovered.

Here Nanhsiungoolithus eggshells are found in the very latest Cretaceous, alongside Macroolithus, Elongatoolithus, Apheloolithus, Prismatoolithus, Stromatoolithus, Ovaloolithus, and Shixingoolithus.

[7] The fossils in Henan are found at the Majiacun Formation, which is slightly older, dating from the Coniacian to the Santonian, and represents the depositions of a meandering stream system.