Aepyornithomimus (meaning "Aepyornis mimic") is a genus of ornithomimid theropod dinosaur from the Late Cretaceous Djadokhta Formation in Mongolia.

The holotype specimen, MPC-D 100/130, was discovered in sediments at the Tögrögiin Shiree locality of the Djadokhta Formation, a locality that is interpreted to be composed of semi-arid eolian sediments with irregular, light gray and cross-bedded sands and sandstones, by Shigeru Suzuki during a joint Japanese (HMNS)—Mongolian (IPG) paleontological expedition to the Gobi Desert in 1994.

The generic name, Aepyornithomimus, is derived from the large ratites Aepyornis and the Latin mimus (meaning mimic), in reference to the similar foot structure.

[1] In a phylogenetic analysis, Aepyornithomimus was found to be a derived ornithomimosaur, closely related to Struthiomimus, Ornithomimus, Gallimimus, and Anserimimus.

A. tugrikinensis is the first diagnostic ornithomimosaur found in these earlier, drier deposits, and indicates the group could tolerate a variety of environmental conditions.