Yongdongaspis, colloquially known as the Binhai Yongdong,[1][2] is an extinct genus of galeaspid vertebrates within the monotypic family Yongdongaspididae.

The type species is Y. littoralis and it was found in the Silurian-aged Huixingshao Formation of China.

[3] This makes it the oldest known fish fossil discovered in Chongqing to date.

[3] Based on the holotype, Yongdongaspis only grew to around 5 centimetres (2.0 in) long.

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