Ust-Ilimsk (Russian: Усть-Илимск, IPA: [usʲtʲ ɪˈlʲimsk]) is a town in Irkutsk Oblast, Russia, located on the Angara River.

[4] Ust-Ilimsk has a subarctic climate (Köppen Dfc) with warm, humid summers and severely cold, drier winters.

A 214-kilometer (133 mi) branch railway connects Ust-Ilimsk to Khrebetovka on the Baikal-Amur Mainline.

Ust-Ilimsk has a tram line, constructed by a local timber company to connect the city center with a nearby sawmill.

There are plans to extend the line to a new mill to the north of the town, as well as to the city railway station.