[en] The solubility of lithium oxide in liquid lithium has been measured in the temperature range of 195 to 734⁰C. A direct sampling method was employed in which nickel sampling tubes fitted with 2 μm pore size filters were used to take samples of the oxide-saturated lithium. The samples, still contained in their sampling tubes, were analyzed for oxygen content by a fast neutron activation method. A value for the oxygen blank attributable to the sampling tubes was derived from a regression analysis of the individual solubility data points. The resulting solubility values are considerably lower than those reported by previous investigators and can be represented by the equations ln S(mol% Li₂O) = 6.054-6669/T, log S* (wppm oxygen) = 6.992 - 2896/T. The results indicate that removal of oxygen from lithium to a level of about 7 wppm (the solubility at 200⁰C) by cold trapping or by filtration should be feasible. (Auth.)