We study lepton flavor violation (LFV) within the Littlest Higgs Model with T parity (LHT) realizing an inverse seesaw (ISS) mechanism of type I. With respect to the traditional LHT, there appear new 𝒪(10 TeV) Majorana neutrinos, driving LFV. For τ →$$ \mathrm{\ell \ell}^{\prime}\overline{\mathrm{\ell}}^{{\prime\prime} } $$ ℓℓ ′ ℓ ¯ ″ (including wrong-sign, ℓ = e, μ) decays and μ → e conversion in Ti, we get typical rates only one order of magnitude below present bounds (ℓ → ℓ′γ can reach the current upper limit) and for Z →$$ \overline{\tau}\mathrm{\ell } $$ τ ¯ ℓ , μ →$$ ee\overline{e} $$ ee e ¯ and conversion in Au, results are within two orders of magnitude from present limits. Correlations among modes are drastically different to the traditional LHT and other models, which would ease the confrontation of this scenario to eventual measurements of LFV processes involving charged leptons.

We first study the hadronic lepton flavor violating tau decays within the littlest Higgs model with T-parity (including one or two pseudoscalars, or a vector resonance). We consider the case where only T-odd particles and partner fermions contribute, and also its extension including Majorana neutrinos coming from an inverse seesaw. In both cases our mean values lie mostly only one order of magnitude below current upper limits, strengthening the case of searching for these decays in the quest for new physics.