Abdarainurus (meaning "Abdrant Nuru tail" after the holotype locality) is a genus of titanosaur dinosaur from the Alagteeg Formation in Mongolia.

The holotype, PIN 5669/1, was discovered in 1970 in Abdrant Nuru, hence the genus name, during a Joint Soviet–Mongolian Paleontological expedition and was excavated by V. P. Tverdokhlebov of Saratov State University.

The more labile characters treated as slightly, or significantly, less important, Abdarainurus was either a basal titanosaur in a clade with Andesaurus and Huabeisaurus or as a member of Aeolosaurinae, respectively.

Diamantinasaurus Normanniasaurus Rinconsaurus Lognkosauria Pitekunsaurus Lithostrotia In their 2024 description of Gandititan, Han et al. recovered it as the sister taxon to Abdarainurus, in a clade of basal titanosaurs also including Andesaurus and Huabeisaurus, like the original analysis by Averianov & Lopatin (2020), in addition to Baotianmansaurus and Dongyangosaurus, which were recovered as part of a slightly more derived clade by Averianov & Lopatin (2020).

[1] The results of their phylogenetic analyses are shown in the cladogram below:[4] Andesaurus Baotianmansaurus Dongyangosaurus Huabeisaurus Abdarainurus Gandititan Daxiatitan Xianshanosaurus Ruyangosaurus Lithostrotia