Anserimimus (/ˌænsərɪˈmaɪməs/ AN-sər-im-EYE-məs; "goose mimic") is a genus of ornithomimid theropod dinosaur, from the Late Cretaceous Period of what is now Mongolia.

Anserimimus was found in the Mongolian aimag, or province, of Bayankhongor during a joint Soviet-Mongolian expedition to the Gobi Desert, in the late 1970s.

In an unpublished thesis Robert Bronowicz in 2005 gave a detailed description of the species, also referring to additional material to it, among which a second partial skeleton, specimen ZPAL MgD-I/65.

The following cladogram is based on Xu et al., 2011:[11] Archaeornithomimus Sinornithomimus Anserimimus Gallimimus Qiupalong Struthiomimus Ornithomimus The function of the powerful arm, with its straightened claws, remains unknown.

The layer Anserimimus was found, is dated from the early Maastrichtian stage of the Late Cretaceous, or about 70 million years ago.

Aside from Gallimimus, other theropods found in the Nemegt Formation include the gigantic Tarbosaurus and Deinocheirus, as well as smaller dromaeosaurids, oviraptorosaurs, troodontids, and birds.

Sediments also indicate that there existed a rich habitat, offering diverse food in abundant amounts that could sustain massive Cretaceous dinosaurs.