Observation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mover accent="true"><mml:mi>B</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mn>0</mml:mn></mml:msup><mml:mo>→</mml:mo><mml:msup><mml:mi>D</mml:mi><mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:mo>*</mml:mo><mml:mo stretchy="false">)</mml:mo><mml:mn>0</mml:mn></mml:mrow></mml:msup><mml:mi>p</mml:mi><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math>

The $B$ meson decay modes $B\ensuremath{\rightarrow}Dp\overline{p}$ and $B\ensuremath{\rightarrow}{D}^{*}p\overline{p}$ have been studied using $29.4\text{ }\mathrm{f}{\mathrm{b}}^{\mathrm{\ensuremath{-}}\mathrm{1}}$ of data collected with the Belle detector at KEKB. The ${\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{0}p\overline{p}$ and ${\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{*0}p\overline{p}$ decays have been observed for the first time with branching fractions $\mathcal{B}({\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{0}p\overline{p})=(1.18\ifmmode\pm\else\textpm\fi{}0.15\ifmmode\pm\else\textpm\fi{}0.16)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ and $\mathcal{B}({\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{*0}p\overline{p})=({1.20}_{\ensuremath{-}0.29}^{+0.33}\ifmmode\pm\else\textpm\fi{}0.21)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. No signal has been found for the ${B}^{+}\ensuremath{\rightarrow}{D}^{+}p\overline{p}$ and ${B}^{+}\ensuremath{\rightarrow}{D}^{*+}p\overline{p}$ decay modes, and the corresponding upper limits at $90%$ C.L. are presented.