A species new to science, Sonerila mapelo Naive, discovered in Pasonanca Natural Park, Zamboanga City, Western Mindanao, Philippines, is herewith described and illustrated. Color plates, notes on its distribution, habitat, phenology, and a comparison to its allied species are provided below. In addition, we took this opportunity to lectotypify the name S. woodii and its synonym S. lilacina. With the discovery of the new species, the Philippines now has a total of three Sonerila taxa, of which two are known to be endemic.