The Bolshoy Ik (Russian: Большой Ик, literally Greater Ik; Bashkir: Оло Ыйыҡ, Olo Iyıq) is a tributary of the Sakmara, which flows south from the southern end of the Ural Mountains in Bashkortostan and Orenburg Oblast, Russia.

The Bolshoy Ik flows into the Sakmara at Saraktash.

The river is generally fed by snowmelt.

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