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Temporal range: Late Eocene to Late Oligocene
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Suborder: Castorimorpha
Family: Castoridae
Subfamily: Agnotocastorinae
Tribe: Agnotocastorini
Genus: Agnotocastor
Stirton, 1935
Type species
Agnotocastor praetereadens

Agnotocastor is an extinct member of the beaver family Castoridae. Unlike its modern relative, this species took the place of muskrats in the rivers of North America during the Oligocene epoch.