Xixianykus is a genus of alvarezsaurid theropod dinosaur from the late Cretaceous period of China.

[1] Known from a slab of rock which contains a partial postcranial skeleton unearthed in the Late Cretaceous (Coniacian-Santonian) Majiacun Formation of the Xixia Basin in Henan, China.

The fossil, holotype XMDFEC V0011, was found in the Majiacun Formation in Henan Province, China.

It was about 50 centimetres long but had 20-centimetre-long (7.9 in) legs and a short femur combined with a long tibia and metatarsus, as well as including an arctometatarsalian pes, a highly modified structure in the feet of theropod dinosaurs used to enhance cursorial capability, which was found within the known fossil material, and these are all good indicators of it being a fast runner.

[2] It was probably covered in feathers and had small, robust arms with one large claw for each hand, as well as a tubular snout used to feed likely on colonial insects.