A technique was developed for the measurement of the interfacial tension between liquid metals and molten salts at elevated temperatures. The technique is based on the measurement of the capillary depression occurring when a capillary, which is moved vertically down through the molten salt layer, passes through the salt/metal interface. The depression is measured by simultaneous video recording of the immersion height of the alumina capillary and the position of a liquid meniscus in a horizontal tube connected to the alumina capillary. The interfacial tension was measured for (a) aluminum and an equimolar melt of NaCl + KCl with several salt additions at 1000 K, (b) aluminum and NaCl + NaF at 1123 K, and (c) aluminum and NaCl + KF at 1123 K. It was found that the interfacial tension decreases with increasing amount of NaF, increases with the increasing amount of MgCl2 additions, remains unchanged with AIF(3) additions, and slightly decreases with the addition of MgF2 and Na(3)AIF(6).