The western black rhinoceros (Diceros bicornis longipes) or West African black rhinoceros was a subspecies of the black rhinoceros, declared extinct by the IUCN in 2011. The western black rhinoceros was believed to have been genetically different from other rhino subspecies. It was once widespread in the savanna of sub-Saharan Africa, but its numbers declined due to poaching. The western black rhinoceros resided primarily in Cameroon, but surveys since 2006 have failed to locate any individuals.

Skull of female black rhino. Holotype of Diceros bicornis longipes. The animal was shot by Adolf Friedrich zu Mecklenburg on 9 January 1911 near Mogrum in the Schari area. Museum Senckenberg, Frankfurt am Main, no. 766 (839) A 54 (4440).

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