Morphological characters useful for supraspecific grouping of hipparionid horses are discussed. On the basis of such characters supraspecific groups are distinguished among Old World hipparions. These are the generaHipparion, Proboscidipparion, andNeohipparion, the latter with the subgeneraNeohipparion andStylohipparion. The relationship of the New World hipparions to the Old World groups is briefly discussed.