Lepton flavor violation at linear collider experiments in supersymmetric grand unified theories

Lepton flavor violation at linear collider experiments is discussed. We show that detectable lepton flavor violation could occur in scalar lepton pair production and decay in the supersymmetric SU(5) grand unified theory in spite of the stringent present experimental constraints by searches for rare processes. Possible cross sections of $\ensuremath{\sim}40$ fb for an ${e}^{+}{e}^{\ensuremath{-}}$ collider and $\ensuremath{\sim}280$ fb for an ${e}^{\ensuremath{-}}{e}^{\ensuremath{-}}$ collider are illustrated.