  The observation of charged lepton flavor violation is a clear sign of physics
beyond the Standard Model (SM). In this work, we investigate the sensitivity of
future lepton colliders to charged lepton flavor violation via on-shell
production of bileptons, and compare their sensitivity with current constraints
and future sensitivities of low-energy experiments. Bileptons couple to two
charged leptons with possibly different flavors and are obtained by expanding
the general SM gauge invariant Lagrangians with or without lepton number
conservation. We find that future lepton colliders will provide complementary
sensitivity to the charged-lepton-flavor-violating couplings of bileptons
compared with low-energy experiments. The future improvements of
muonium-antimuonium conversion, lepton flavor non-universality in leptonic
{\tau} decays, electroweak precision observables and the anomalous magnetic
moments of charged leptons will also be able to probe similar parameter space.
