An oak is a tree or shrub in the genus Quercus, one of several related genera in the family Fagaceae, or any one of a number of trees in other families that have characteristics similar to those of Quercus.

Various tanbark oak or stone oak species in genera:

• Lithocarpus
• Notholithocarpus

• Members of the Casuarinaceae have tough, dense wood reminiscent of species of Quercus used for timber.
  • Allocasuarina, she-oak
    • Allocasuarina decaisneana, desert oak
  • Casuarina, she-oak
    • Casuarina glauca, swamp oak
• Lagunaria of the Malvaceae is called white oak because__________
• A number of species of Proteaceae are called Silky oak because of their Quercus-like timber.
• Grey oak is used for a species of Casuarina and a species of Grevillea.
• Toxicodendron of the Anacardiaceae has two species called "poison oak", because of their leaf shape.

• Quercus (disambiguation)
  • List of Quercus species
• Oaks (disambiguation)
• Oak Tree (disambiguation)