The Phasianinae (Horsfield, 1821) are a subfamily of the pheasant family (Phasianidae) of landfowl, the order Galliformes. The subfamily includes pheasants, tragopans, junglefowl, peafowl, and similar birds. Although this subfamily was considered monophyletic and separated from the partridges, francolins, and Old World quails (Perdicinae) till the early 1990s, molecular phylogenies have shown that the two Phasianidae subfamilies actually constitute only one lineage. For example, some partridges (genus Perdix) are more closely affiliated to pheasants, whereas Old World quails and partridges from the genus Alectoris are closer to junglefowls.