The white-legged duiker (Cephalophus crusalbum) is a medium-sized antelope species from the subfamily of duikers (Cephalophinae) within the family of bovids (Bovidae). It was described as subspecies of the Ogilby's Duiker (Cephalophus ogilbyi) by Peter Grubb in 1978. After a revision of the ungulates in 2011 by Colin Groves, it is now regarded as distinct species.