In the title heterodinuclear complex, [CuNa(C(8)H(7)O(3))(2)(NO(3))](n), the Cu(II) ion is five-coordinated in a square-pyramidal arrangement by four atoms of two different ligand molecules in equatorial positions and one remote nitrate O atom in the apical position. The Na(+) ion is eight-coordinated by four ligand O atoms and four nitrate O atoms. The ligand links the Cu(II) and Na ions, forming a layered arrangement extending parallel to (001).