Quercus congesta is a species of oak endemic to southern Italy, including Sicily, Sardinia, and the southern Italian mainland.
Quercus congesta is a large tree, growing up to 20 metres tall.
Quercus congesta is endemic to Italy, where it is found on the islands of Sardinia and Sicily, and in Calabria on the southern Italian mainland. The species' estimated extent of occurrence (EOO) is over 140,000 km2. It common in Sicily and Sardinia, and less common in Calabria.
Quercus congesta typically grows in mixed acidophilic forests.
The species is common, and its population is not declining. It faces potential threats from fire, deforestation, livestock grazing, and land development. Its conservation status is assessed as Least Concern.