Rhopalocarpus similis is a tree in the family Sphaerosepalaceae. It is endemic to Madagascar.
Rhopalocarpus similis is a widespread species in Madagascar. Its habitat is both dry and wet forests and thickets from sea-level to 1500m (4,900feet) altitude. Some populations are within protected areas.
Rhopalocarpus similis is threatened by shifting patterns of agriculture, resulting in deforestation. Because the species is used as timber and firewood, subsistence harvesting is also a threat. Wildfires also pose a threat.
Rhopalocarpus similis is used by the Malagasy population to treat swelling, joint pain, and wound healing.