Polonium tetranitrate is an inorganic compound, a salt of polonium and nitric acid with the chemical formula Po(NO3)4.

[1] The compound is radioactive, forms white crystals.

[2][3] Dissolution of metallic polonium in concentrated nitric acid:[citation needed] Polonium(IV) nitrate forms white[4] or colorless crystals.

[5] It dissolves in water with hydrolysis.

It disproportionates in aqueous weakly acidic nitric acid solutions: The polonium(II) ion (Po2+) is then oxidized by nitric acid to polonium(IV).