Separation of selected lanthanoid elements was performed by high speed countercurrent chromatography (CCC) employing a support–free stationary phase of 2–ethylhexylphosphonic acid mono–2–ethylhexyl ester (EHPA) in toluene. Middle lanthanoids (Sm, Eu, Gd, Tb, Dy) were chromatographically eluted in their increasing order of extractability by passing the aqueous mobile phase of pH buffers. The mixtures of lanthanoid elements of different concentrations were isolated into individual elements of high purity by one–step chromatographic operation.