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.