The Bolshaya Tereshka () or simply Tereshka is a river in the Ulyanovsk and Saratov oblasts of the Russian Federation, a tributary of the Volga. The Tereshka is long, and its watershed covers . It begins in the Privolzhskaya Hills and flows to the Volgograd Reservoir. Ice on the Tereshka forms in November or December and thaws in March or April.