Self diffusion coefficients for the two tracers In114and Sn113in the liquid alloy indium‐tin at the eutectic composition have been measured as a function of temperature in the range 200°C–450°C. The customary Arrhenius equation is used to describe the experimental results. For indium as a tracer we obtainedD=(42.5±5.7) 10−5 exp−2771±158RTcm2/sec,and for tinD=(11.7±1.7) 10−5 exp−1380±156RTcm2/sec.It is possible that the large difference between the two activation energies could be associated with properties of the eutectic composition.