Bolshaya Oka (Russian: Большая Ока; Bashkir: Оло Аҡа, Olo Aqa) is a rural locality (a selo) and the administrative centre of Bolsheokinsky Selsoviet, Mechetlinsky District, Bashkortostan, Russia.

Bolshaya Oka is located 17 km north of Bolsheustyikinskoye (the district's administrative centre) by road.

Srednyaya Oka is the nearest rural locality.

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