Barium hydrogen phosphate is an inorganic compound with the chemical formula BaH2PO4. It is a white solid that is soluble in water.

Barium hydrogen phosphate is mainly used in the industry to make other phosphate products, such as barium phosphate, and is also used as a raw material in the ceramic industry. In the laboratory, it can be used as a chemical reagent for analytical chemistry and the preparation of phosphate buffered solutions.