Magnesium chromate is an inorganic compound with the chemical formula . It is a yellow, odorless, water-soluble salt. It is available commercially in a variety of powders, from nanoscale to micron-sized, either as an anhydrous or hydrated form.
As a hydrate, it is useful as a corrosion inhibitor and pigment.
Before 1940, the literature about magnesium chromate and its hydrates was sparse, but studies starting in that year looked at its properties and solubility.
In 2011, an undecahydrate (containing 11 molecules of water) of this compound was discovered.