Yandangornis is a genus of theropods (possibly avialans) from the Late Cretaceous Tangshang Formation of China.

The holotype specimen is a mostly complete skeleton in the collection of the Zhejiang Museum of Natural History, with accession number M1326.

The specimen is small, roughly the size of Archaeopteryx, with a total length around 58.8 centimetres (1.93 ft), of which 30.5 centimeters (1 foot) is tail.

This lifestyle may have evolved in response to the long, heavy tail of the genus, which would have inhibited flying ability.

[1] Cai and Zhao placed Yandangornis in a monotypic family (Yandangithidae) and order (Yandangithiformes) in the subclass Sauriurae of the class Aves.

[4] Yandangornis is poorly documented in literature, and discussion of the genus has generally been omitted from recent reevaluations of avialan systematics.