  This is a review of rare and forbidden decays of the $\tau$ lepton. For the
rare decays, this includes new results on the chiral anomaly decay
$\taupietapio$, new upper limits on the second-class-current decay $\taupieta$,
and the observations of the Cabibbo-suppressed decay $\tauketa$ and the
internal conversion decay $\taueee$. For the forbidden decays, there are new
upper limits on the radiative decays $\tauegamma$ and $\taumugamma$. Some
forbidden decays which have not been previously searched for are also
suggested.
