Fukuivenator ("hunter of Fukui Prefecture") is an extinct genus of maniraptoran theropod dinosaur from the Early Cretaceous of Japan.

The type species Fukuivenator paradoxus was named and described in 2016 by Yoichi Azuma, Xu Xing, Masateru Shibata, Soichiro Kawabe, Kazunori Miyata and Takuya Imai.

The rocks in which the skeleton of Fukuivenator, holotype FPDM-V8461, was found in August 2007 belong to the Kitadani Formation, which is probably of Barremian or Aptian age.

A phylogenetic analysis performed by the research team that described Fukuivenator found it to be a primitive member of the group Maniraptoriformes, in an unresolved position equally closely related to ornithomimosaurs, maniraptorans, and Ornitholestes.

[1] A 2021 study determined it a basal member of the therizinosaurs, as shown below:[2] Bicentenaria Zuolong Tyrannosauroidea Tugulusaurus Ornitholestes Compsognathidae Ornithomimosauria Alvarezsauria Fukuivenator Falcarius Beipiaosaurus Alxasaurus Erliansaurus Therizinosauridae Oviraptorosauria Deinonychosauria Avialae Another enigmatic maniraptoran, Migmanychion, is supported as the closest taxon to Fukuivenator based on phylogenetic analyses:[3] Coelurus Migmanychion Avialae Because of the long neck and the heterodont unserrated teeth, the probably foremost of which had flattened outer ends, the describing authors suggested that Fukuivenator was no longer a pure carnivore but had adapted itself to a herbivorous or at least omnivorous diet.