The Ilovlya (Russian: Иловля) is a river in Saratov and Volgograd Oblasts of Russia. It is a left tributary of the Don, and is 358 kilometres (222 mi) long, with a drainage basin of 9,250 square kilometres (3,570 sq mi).

The average discharge is 9.6 cubic metres per second (340 cu ft/s). The river is frozen over from December to March. In earlier times there was a portage here, between the watersheds of the Volga River and Don River.