Assan (Russian: Ассанский язык) is an extinct Yeniseian language spoken to the south of Krasnoyarsk in Russia. It went extinct in the 18th century. It is similar enough to the Kott language that it can be regarded as a dialect of it, but the Assan identified as a separate ethnicity from the Kotts.
Before its extinction, in 1735-1740, there were two to three speakers of Assan.