The Tukulan (Russian: Тукулаан; Yakut: Тукулан) is a river in the Sakha Republic (Yakutia), Russia, a right tributary of the Aldan, part of the Lena basin.

In the upper section of its course the river flows across mountainous terrain, heading roughly southwestwards across the Sordogin Range.

[3][4] After leaving the mountainous area the Tukulan flows approximately in the same SW direction along its middle course.

It crosses a floodplain dotted with about 200 lakes where the riverbed divides into slowly-flowing arms.

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