Corylaceae, or the Hazel Family, includes a small number of trees and shrubs, including the hazels, the hornbeams and the hop-hornbeams. Many botanists include the Corylaceae within the closely related Betulaceae, but it is treated as distinct in the major Kew checklist of the Fagales.

Example species of the three genera are:

• Corylus - hazel
  • European hazel, Corylus avellana
  • Filbert, Corylus maxima
  • Turkish hazel, Corylus colurna
• Carpinus - hornbeam
  • European hornbeam, Carpinus betulus
  • American hornbeam, Carpinus caroliniana
• Ostrya - hop-hornbeam
  • European hop-hornbeam, Ostrya carpinifolia
  • American hop-hornbeam, Ostrya virginiana

Fagales