Taking the solar and the atmospheric neutrino experiments into account we discuss the lepton flavor violating processes, such as \(\tau\to\mu\gamma\) or \(\mu\to e\gamma\), in the minimal supersymmetric standard model with right-handed neutrinos (MSSMRN) and the supersymmetric SU(5) GUT with right-handed neutrinos (SU(5)RN). The predicted branching ratio of \(\mu\to e\gamma\) in the MSSMRN with the MSW large angle solution is so large that it goes beyond the current experimental bound if the second-generation right-handed Majorana mass \(M_{\nu_2}\) is greater than \(\sim 10^{13}(\sim 10^{14})\)GeV for \(\tan\beta=30(3)\). When we take the MSW small angle solution, the \(\mu\to e\gamma\) rate is at most about 1/100 of that of the MSW large angle solution. The 'just so' solution implies \(10^{-5}\) of that of the MSW large angle solution. Also, in the SU(5)RN the large \(\mu\to e\gamma\) rate naturally follows from the MSW large angle solution, and the predicted rate is beyond the current experimental bound if the typical right-handed Majorana mass \(M_N\) is larger than \(\sim 10^{13}(\sim 10^{14})\)GeV for \(\tan\beta=30(3)\), similarly to the MSSMRN. We show the multimass insertion formulas and their applications to \(\tau\to\mu\gamma\) and \(\mu\to e\gamma\).