Leufuichthys ("Leufú fish") is an extinct genus of clupeomorph fish which existed in Patagonia, Argentina during the late Cretaceous epoch (Turonian or Coniacian stage).

It was first named by Valéria Gallo, Jorge O. Calvo and Alexander W.A.

Kellner in 2011 and the type species is Leufuichthys minimus.

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