The Siberut langur (Presbytis siberu) is a species of monkey in the family Cercopithecidae.

It was formerly considered a subspecies of the Mentawai langur, Presbytis potenziani (as Presbytis potenziani siberu) but genetic analysis revealed that these are separate species.

[2][3][4] The Siberut langur is native to the island of Siberut in Indonesia.

It is listed as endangered by the IUCN.

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