Kassina mertensi is a species of frog in the family Hyperoliidae.

It is endemic to northeastern Democratic Republic of the Congo.

[1][2] The specific name mertensi honours Robert Mertens, a German zoologist and herpetologist.

[3] Common name Mertens' running frog has been coined for it.

[2] Kassina mertensi occurs clearings in rainforest as well as in heavily degraded former forest (farm bush).