Bolshoy Cheremshan (Russian: Большой Черемшан, literally Greater Cheremshan, Tatar: Олы Чирмешән) is a river in Russia, a left tributary of the Volga between the Kama and Samara. It is 336 kilometres (209 mi) long, and has a drainage basin of 11,500 square kilometres (4,400 sq mi). It flows southwest to the Volga near Dimitrovgrad. The main inflows are the Bolshaya Sulcha and Maly Cheremshan. The maximal discharge is 1,660 cubic metres per second (59,000 cu ft/s) (1979), and the minimal mineralization is 600-800 mg/l. The riverbed is meandering and the meadows are wide. From around 1650 the Trans-Kama Line of forts ran along or near the Cheremshan.

• "Олы Чирмешән". Tatar Encyclopaedia (in Tatar). Kazan: The Republic of Tatarstan Academy of Sciences. Institution of the Tatar Encyclopaedia. 2002.