The total magnetic susceptibility of high-purity copper has been measured between 300°K and 1.45°K using the Gouy method. It is found that the mass susceptibility can be represented by χ=(-0.083+0.023T)×10-6 cgs unit. This temperature dependence is much smaller than that found by previous workers, whose data extends only down to 14°K. An anomaly in the susceptibility at low temperatures, previously reported, was not found. The nuclear susceptibility of copper is responsible for about one-fifth of the temperature dependence found in the present work; the remainder can be explained by a paramagnetic impurity content which is plausible for the particular copper used. It is concluded that the susceptibility of pure copper is substantially independent of temperature in the measured range.