Abstract The lepton flavour violating processes μ →e γ , μ →ee + e − and ( μ , e) conversion in the presence of nuclei are discussed in supergravity models. The dominant contribution arises from charged s-lepton mixing, if one goes beyond the tree level and includes renormalization effects. The branching ratio for (μ, e) conversion is obtained using reliable nuclear form factors. The resulting branching ratios are enhanced compared to those of more traditional models but they are still much smaller than the present experimental limits.