  Superconductivity in BaPtSb with the SrPtSb-type structure (space group
$P\bar{6}m2$, $D_{3h}^1$, No. 187) is reported. The structure consists of a
PtSb ordered honeycomb network that stacks along the $c$-axis so that spatial
inversion symmetry is broken globally. Electrical resistivity and specific-heat
measurements revealed that the compound exhibited superconductivity at 1.64 K.
The noncentrosymmetric structure and the strong spin-orbit coupling of Pt and
Sb make BaPtSb an attractive compound for studying the exotic superconductivity
predicted for a honeycomb network.
