Yanliaomyzon is an extinct genus of predatory lampreys that lived approximately 163 million years ago during the Middle Jurassic.

It is found in the Yanliao Biota, including both the Daohugou Beds and the Tiaojishan Formation in Liaoning province, northern China.

[1] The species Y. occisor has a body length of 64 centimetres (25 in), which would make it the largest extinct fossil lamprey discovered.

Based on its similarities to Mesomyzon, Yanliaomyzon likely had a three phase life cycle with ammocoete larvae, though no juvenile specimens are known.

The relatively large body size suggests that the species were anadromous, migrating from the sea into freshwater to spawn.