Thermal conductivity (&lgr;) of a high‐purity iron (99.998+% Fe) has been studied as a function of temperature (T) between 7° and 200°K. The &lgr; vsTcurve reaches a maximum of about 15 W‐cm−1°K−1at 21°K. This value is considerably larger than that of 4.5 W‐cm−1°K−1observed before by Kempet al.in 1959. Our measurements are in qualitative agreement with the theoretical expectations for a high‐purity iron. The problem, associated with accurate determination of the Lorenz number and the thermal resistivity due to electron‐phonon scattering at low temperatures in iron, is briefly discussed.