Nessovbaatar is a genus of extinct mammal from the Upper Cretaceous of Mongolia. It its living in the company of Central Asian dinosaurs. This animal was a member of the extinct order Multituberculata within the suborder Cimolodonta and family Sloanbaataridae.
The genus Nessovbaatar ("Nesov's hero") was named by Kielan-Jaworowska Z. and Hurum J.H. in 1997 in honour of Russian paleontologist Dr. Nesov. The only known species is Nessovbaatar multicostatus (Kielan-Jaworowska & Hurum 1997), fossils of which were found in the Upper Cretaceous Barun Goyot Formation of Mongolia.