  We study $T$ violation in the three-body charmless baryonic decay of $\bar
B^0 \ra \Lambda \bar p \pi^+$ through the $T$-odd triple product correlation in
the standard model. We find that the $T$ violating asymmetry is 10%, which is
accessible to the current B factories at KEK and SLAC, while the CP violating
one 1.1%. We emphasize that this triple product correlation would be the first
measurable direct $T$ violating effect predicted in the standard model.
