  We report the first observation of a near-threshold enhancement in the
$D^0\bar{D}^0\pi^0$ system from $B \to D^0\bar{D}^0\pi^0 K$ decays using a 414
$\mathrm{fb}^{-1}$ data sample collected at the $\Upsilon(4S)$ resonance. The
enhancement peaks at a mass $M=3875.4 \pm 0.7_{-2.0}^{+1.2}$ MeV/$c^2$ and the
branching fraction for events in the peak is \Br ($B \to D^0\bar{D}^0\pi^0
K$)=(1.27 $\pm$ 0.31 $_{-0.39}^{+0.22})$ $\times$ $10^{-4}$. The data were
collected with the Belle detector at the KEKB energy-asymmetric $e^+e^-$
collider.
