Sergeyevka (Russian: Сергеевка) is a rural locality (a village) in Novonadezhdinsky Selsoviet, Blagoveshchensky District, Bashkortostan, Russia.

Sergeyevka is located 24 km northeast of Blagoveshchensk (the district's administrative centre) by road.

Olkhovka is the nearest rural locality.

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