Bismuth phosphide is an inorganic compound of bismuth and phosphorus with the chemical formula BiP.

The reaction of sodium phosphide and bismuth trichloride in toluene (0 °C):

When heated in air, bismuth phosphide burns.

When heated in an atmosphere of carbon dioxide, a gradual volatilization of phosphorus is observed.

This compound is oxidized when boiled in water.

All strong acids dissolve it.

The compound is a semiconductor used in high power, high frequency applications and in laser diodes.