The Ilim (Russian: Илим) is a river in Irkutsk Oblast in Russia, a right tributary of the Angara.

It flows north between and parallel to the rivers Angara and Lena, and then swings west to join the Angara 40 kilometres (25 mi) south of Ust-Ilimsk.

[1] The river freezes up in late October and stays icebound until early May.

Its main tributaries are the Kochenga and the Tuba from the right, and the Chora from the left.

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