Nepenthes masoalensis ( /nɨˈpɛnθiːz ˌmæsɵˈlɛnsɪs/; from Masoala, a peninsula in northeast Madagascar) is one of two tropical pitcher plant species from Madagascar, the other being N. madagascariensis.
Nepenthes masoalensis is known only from eastern Madagascar; it occurs in the Masoala Peninsula and the Mount Ambato region. It has been recorded from Pandanus and Sphagnum swamps, mountain ridgetops, and xerophytic vegetation. Nepenthes masoalensis is a lowland species, growing at 0–400 m altitude.