Hyperolius diaphanus is a species of frog in the family Hyperoliidae. It is endemic to the eastern Democratic Republic of the Congo and is known from near the Itombwe Mountains and the mountains to the west of Lake Kivu. Limits of its range are not clear and might extend into the adjacent Burundi and Rwanda. Common names Kigulube reed frog and translucent reed frog have been proposed for this species.