Fe(NH3)(2)PO4 is synthesized under mild hydrothermal conditions in the presence of urea. The crystal structure is solved fur powder X-ray diffraction data. The unit cell is orthorhombic, a = 10.1058(2) Angstrom, b = 6.3676(2) Angstrom, c 7.5714(2) Angstrom, space group Pnma, Z = 4. The structure consists of a three-dimensional network of FeO4N2 octahedra and PO4 tetrahedra linked by vertex sharing. Two crystallographically independent ammonia molecules are linked to the iron atom. This compound is the first three-dimensional solid structurally characterized containing Fe-NH3 bonds.