Quercus or oak, is a genus of trees and shrubs.
Quercus may also refer to:
Organization Quercus (organization), a Portuguese association for the conservation of the natural environment Quercus (publisher), a British publishing house Quercus, developer of a Rexx interpreter
Other uses Quercus (software), a Java implementation of the PHP language Quercus (album), a 2013 album by June Tabor, Huw Warren & Iain Ballamy
See also List of Quercus species Quercia (disambiguation)