The Omolon (Russian: Омолон; Yakut: Омолоон, Omoloon) is the principal tributary of the Kolyma in northeast Siberia.

It begins in the Kolyma Highlands, Magadan Oblast, less than 100 kilometres (62 mi) from the Sea of Okhotsk, flows first northeast, with the Kedon Range to the west, then it bends northwest and forms part of the border of Magadan and Chukotka, with the Yukaghir Highlands to the west.

At the western end of the Ush-Urekchen it turns north and crosses Chukotka, briefly enters the Sakha Republic and joins the Kolyma 282 kilometres (175 mi) upstream from the Arctic.

[3] The upper Omolon is subalpine in the highlands, the middle is boreal forest and the lower part tundra.

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