Ameribaatar is an extinct mammal of the Late Cretaceous.

It lived in North America during the Mesozoic, also known as the "age of the dinosaurs".

The genus Ameribaatar ("American hero") was named by Eaton and Cifelli in 2001.

Its fossil remains were discovered in strata dating to the Albian-Cenomanian boundary (also the Lower-Upper Cretaceous boundary) in the Cedar Mountain Formation, Utah (USA).

The species name honours Zofia Kielan-Jaworowska.