  Tau leptons are powerful tools to probe physics beyond the Standard Model
(SM). The Belle II experiment is installed at the SuperKEKB asymmetric energy
electron-positron collider and aims at collecting the world's largest sample of
tau pair events $e^{+}e^{-}\rightarrow \tau^+ \tau^-$. Direct searches for new
invisible mediators, charged lepton flavor violation in $\tau$ decays, and
tests of the SM via precision measurements of $\tau$ lepton properties and
couplings are reported in the following article. The results presented here are
based on the data collected by Belle II during 2019-2021.
