Achillobator ( ; meaning "Achilles hero") is a genus of large dromaeosaurid dinosaur that lived in Asia during the Late Cretaceous period about 96 million to 89 million years ago in what is now the Bayan Shireh Formation. The genus is currently monotypic, only including the type species A. giganticus. The first remains were found in 1989 during a Mongolian-Russian field expedition in Mongolia and later described in 1999. Remains at the type locality of "Achillobator" may represent additional specimens. It represents the first and largest dromaeosaurid known from the Bayan Shireh Formation.