Barium selenate is an inorganic compound with the chemical formula BaSeO4.

[3] Barium selenate can be obtained from the reaction of any soluble barium salt and sodium selenate:[1] Barium selenate is a white solid that is slightly soluble in water.

It has an orthorhombic baryte-type crystal structure with the space group Pnma (space group no.

[5] Barium selenate has been used as a "slow release" source of selenium for grazing animal feed crops and was intended to ensure selenium supply to grazing animals.

In Switzerland and the EU, direct use as a feed additive is prohibited.