A study is made of sulphur diffusion in copper single crystals using 35S between 550 and 1000 "C. The plot log D = f(l/T) was not a straight line. Different models were examined t o explain the departure from linearity in the Arrhenius plot. A simple model is proposed, basing on classical mechanisms : monovacancy diffusion and diffusion along randomly distributed dislocations. For T > 800 "C, Q = 2.14 eV, and Do = 23 cm2 s-l, the unusually high diffusion coefficients do not agree well with the value of Q, similar to that of self diffusion. For T < 800 "C, the dislocation model gives a binding energy of some tenths of an electron-volt.La diffusion du soufrtl dans le cuivre monocristallin est 6tudi6e entre 550 et 1000 "C
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