The Olrog's four-eyed opossum (Philander olrogi), is a species of gray and black four-eyed opossum found in eastern Bolivia, first described in 2008 based on specimens collected in 1974. It inhabits the lowland Amazon rainforest, with an elevation range of 150 to 250 m. The species is named after Swedish-Argentine biologist Claes C. Olrog. It is sympatric with the Gray four-eyed opossum, which it resembles. The two species differ in several ways, such as ventral fur color and condition of the zygomatic arch.