Quercus faginea, the Portuguese oak, is a species of oak native to the western Mediterranean region in the Iberian Peninsula and the Balearic Islands. Similar trees in the Atlas Mountains of northwest Africa are usually included in this species, or sometimes treated as a distinct species Quercus tlemcenensis. It occurs in mountains between 0–1900 metres altitude, and flourishes in a variety of soils and climates. The species commonly develops galls due to gall wasp activity; the galls are brown, 1–2 cm diameter, and have a spongy, cork-like interior. There are two subspecies: