Ilovlya (Russian: Иловля) is a river in Saratov and Volgograd Oblasts of Russia. It is a left tributary of the Don River, and is 358 km long, with a drainage basin of 9250 km². The average discharge is 9,6 m³/s. The river is frozen over from December to March. In earlier times there were a portage here, between the watersheds of the Volga and Don Rivers.