  We investigate contributions to the anomalous magnetic moments of charged
leptons in the neutrino-extended Standard Model Effective Field Theory
($\nu$SMEFT). We discuss how $\nu$SMEFT operators can contribute to a lepton's
magnetic moment at one- and two-loop order. We show that only one operator can
account for existing electronic and muonic discrepancies, assuming new physics
appears above $1$ TeV. In particular, we find that a right-handed charged
current in combination with minimal sterile-active mixing can explain the
discrepancy for sterile neutrino masses of $\mathcal O(100)$ GeV while avoiding
direct and indirect constraints. We discuss how searches for sterile neutrino
production at the (HL-)LHC, measurements of $h\rightarrow \mu^+ \mu^-$ and
searches for $h\rightarrow e^+ e^-$, neutrinoless double beta decay
experiments, and improved unitarity tests of the CKM matrix can further probe
the relevant parameter space.
