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 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.

Coordinates: 49°13′39″N 43°55′07″E / 49.22750°N 43.91861°E / 49.22750; 43.91861