Beryllium sulfide (BeS) is an ionic compound from the sulfide group with the formula BeS.

It is a white solid with a sphalerite structure that is decomposed by water and acids.

[3] Beryllium sulfide powders can be prepared by the reaction of sulfur and beryllium in a hydrogen atmosphere by heating the mixture for 10-20 minutes at temperatures from 1000-1300 °C.

If done at 900 °C, there is beryllium metal impurities.

[4] Alternatively, it can be prepared by the reaction of beryllium chloride and hydrogen sulfide at 900 °C.