A novel gallium phosphate, Ga(2,2'-bipy)(HPO4)(H2PO4) (denoted FJ-12; FJ = Fujian Institute of Research on the Structure of Matter), which is the first example of layered inorganic-organic hybrid gallium phosphate with neutral framework, has been hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction. This compound crystallizes in the monoclinic system, space group P2(1)/c (No. 14), with a = 10.9443(9), b = 15.8253(13), and c = 8.4201(7) Angstrom, beta = 108.898(2)degrees, V = 1379.7(2) Angstrom(3), and Z = 4. The structure consists of HPO4 and H2PO4 tetrahedra and unusual GaO4N2 octahedra which are linked through their vertexes forming an undulated sheetlike structure with 4.12-net. The adjacent layers are stably packed together and exhibit interesting 3-D supramolecular arrays pi-pi interactions of the 2,2'-bipy groups.