Rheocles derhami is a species of rainbowfish in the subfamily Bedotiinae, the Madagascar rainbowfishes.

[2] It is endemic to the Ambalona River and Mangarahar River in Madagascar.

Its natural habitat is rivers.

[1] It was described by Melanie Stiassny and Damaris Rodriguez in 1992[3] and was named in honour of the Swiss conservationist Patrick De Rham.

This Atheriniformes article is a stub.