Transference numbers and mean ionic activity coefficients of solutions of potassium chloride and sodium chloride in glycerol have been measured at 25°C using concentration cells with silver/silver chloride electrodes. The EMFs of cells with transference, using a liquid junction, were measured at concentrations between 0.001 and 0.5 mol dm−3, and the EMFs of cells without transference were measured using a potassium or sodium amalgam to link the two half-cells, at concentrations in the range 0.05 to 0.5 mol dm−3. Using the Nernst equations, cation transference numbers of 0.479 and 0.417 were deduced respectively for solutions of potassium chloride and sodium chloride in glycerol at a concentration of 0.1 mol dm−3. Activity coefficients for both salts were deduced as a function of concentration up to 0.5 mol dm−3, using independent data on the low concentration transference numbers. The results indicate similarities between the solvent properties of glycerol and water.