  We review the two and three-body baryonic $B$ decays with the dibaryon (${\bf
B\bar B'}$) as the final states. Accordingly, we summarize the experimental
data of the branching fractions, angular asymmetries, and $CP$ asymmetries.
Using the $W$-boson annihilation (exchange) mechanism, the branching fractions
of $B\to {\bf B \bf \bar B'}$ are shown to be interpretable. In the approach of
perturbative QCD counting rules, we study the three-body decay channels. In
particular, we review the $CP$ asymmetries of $B\to {\bf B\bar B'}M$, which are
promising to be measured by the LHCb and Belle~II experiments. Finally, we
remark the theoretical challenges in interpreting ${\cal B}(B^-\to p\bar
p\rho^-)$ and ${\cal B}(B^-\to p\bar p\mu^-\bar \nu_\mu)$.
