  We report the discovery of superconductivity on high-quality single crystals
of transition-metal pnictides WP grown by chemical vapor transport (CVT)
method. Bulk superconductivity is observed at Tc = 0.84 K under ambient
pressure by electrical resistivity and AC magnetic susceptibility measurements.
The effects of magnetic field on the superconducting transitions are studied,
leading to a large anisotropy parameter around 2 with the in-plane and
out-of-plane upper critical fields of Hc2=172 Oe and Hc2\=85 Oe, respectively.
Our finding demonstrates that WP is the first superconductor in 5d
transition-metal at ambient pressure in MnP-type, which will help to search for
new superconductors in transition-metal pnictides.
