Gryaznushka (Russian: Грязнушка) is a rural locality (a selo) in Mikhaylovsky Selsoviet of Blagoveshchensky District, Amur Oblast, Russia.

Gryaznushka is located on the bank of the Gryaznushka River, 62 km north of Blagoveshchensk (the district's administrative centre) by road.

Mikhaylovka is the nearest rural locality.

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