In systems containing gallium (III) and hydrochloric acid, extraction with pure IPE and a mixture of IPE - pentanol was studied. The influence of the initial concentration of acid and the solvent composition as well as the temperature on the extraction of the gallium and the equilibrated phase volumes was examined. The synergistic extraction of gallium (III)was found with a mixture of IPE - pentanol and a maximum value of ΔD in a 20 %vol. of alcohol mixture. The conditions of the third liquid phase formation were found and its effect on the extraction was discussed.