Phoxinus is a genus of freshwater fish in the carp family (family Cyprinidae) of order Cypriniformes. The type species is Phoxinus phoxinus (the minnow or Eurasian minnow). The North American members of this genus are known as daces and the Old World ones as Eurasian minnows.
Within the diverse family Cyprinidae, Phoxinus the only genus with a Holarctic distribution, being present both in Eurasia and North America. It contains minimally three Eurasian and seven North American species, or up to 20 species in all according to FishBase. Molecular data however indicate that Phoxinus is not a natural, monophyletic taxon.