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We analyze in detail lepton-flavor violation (LFV) in the charged-leptonsector such as $\mu \to e \gamma$, $\tau \to \mu \gamma$, $\mu \to eee$ and the$\mu \to e$ conversion in nuclei, within the framework of supersymmetric modelswith lopsided Froggatt--Nielsen charges, in which the large mixing in theneutrino sector as well as small mixings in the quark sector can be naturallyaccommodated. We show that the present experimental limits on the LFV processesalready exclude some of the models. The future proposed search for LFV,especially in muon processes, can provide a significant probe to thisframework. We also stress the importance of the measurement of $U^{MNS}_{e3}$in neutrino experiments, and the fact that the KamLAND experiment could play asignificant role to test a certain class of models.

Neutrino masses and lepton-flavor violation in supersymmetric models with lopsided Froggatt-Nielsen charges