  We present a search for the decay $B^{-} \to \tau^{-} \bar{\nu}_{\tau}$ in a
sample of $88.9 \times 10^{6}$ $B\bar{B}$ pairs recorded with the BaBar
detector at the SLAC $B$-Factory. One of the two $B$ mesons from the
$\Upsilon(4S)$ is reconstructed in a hadronic or a semileptonic final state and
the decay products of the other $B$ in the event are analyzed for consistency
with a $B^{-} \to \tau^{-} \bar{\nu}_{\tau}$ decay. We find no evidence of a
signal and set an upper limit on the branching fraction of $\mathcal{B}(B^{-}
\to \tau^{-} \bar{\nu}_{\tau}) < 4.2 \times 10^{-4}$ at the 90% confidence
level.
