Leptodactylodon mertensi is a species of frog in the family Arthroleptidae. It is endemic to the mountains of western Cameroon and occurs on the southern slopes of the Bamileke Plateau, Mount Nlonako, and Mount Manengouba. The specific name mertensi honours Robert Mertens, a German zoologist and herpetologist. Common name Mertens' egg frog has been coined for it.