  We use spin correlations to constrain anomalous $\tau$-lepton couplings at
the LHC including its anomalous magnetic moment, electric dipole moment and
weak dipole moments. Single spin correlations are ideal to probe interference
terms between the SM and new dipole-type couplings as they are not suppressed
by the $\tau$-lepton mass. Double spin asymmetries give rise to $T$-odd
correlations useful to probe $CP$ violation purely within the new physics
amplitudes, as their appearance from interference with the SM is suppressed by
$m_\tau$. We compare our constraints to those obtained earlier on the basis of
deviations from the Drell-Yan cross-section.
