The Fagales are an order of flowering plants, including some of the best-known trees. The order name is derived from genus Fagus, beeches. They belong among the rosid group of dicotyledons. The families and genera currently included are as follows:

• Betulaceae - birch family (Alnus, Betula, Carpinus, Corylus, Ostrya, Ostryopsis)
• Casuarinaceae - she-oak family (Allocasuarina, Casuarina, Ceuthostoma, Gymnostoma)
• Fagaceae - beech family (Castanea, Castanopsis, Chrysolepis, Colombobalanus, Fagus, Formanodendron, Lithocarpus, Notholithocarpus, Quercus, Trigonobalanus)
• Juglandaceae - walnut family (Alfaroa, Carya, Cyclocarya, Engelhardia, Juglans, Oreomunnea, Platycarya, Pterocarya, Rhoiptelea)
• Myricaceae - bayberry family (Canacomyrica, Comptonia, Myrica)
• Nothofagaceae - southern beech family (Fuscospora, Lophozonia, Nothofagus, Trisyngyne)
• Ticodendraceae - ticodendron family (Ticodendron)