In the title compound, [NiCl(C(10)H(7)N(3)S)(2)(H(2)O)]NO(3), the Ni(II) ion is coordinated by four N atoms from two chelating 2-(1,3-thia-zol-4-yl)-1H-benzimidazole ligands, one Cl atom and one water mol-ecule in a distorted octa-hedral geometry. In the crystal, O-H⋯O, N-H⋯O and N-H⋯Cl hydrogen bonds link the complex cations and nitrate anions into a three-dimensional network. π-π inter-actions between the thia-zole and imidazole rings and between the thia-zole and benzene rings are observed [centroid-centroid distances = 3.592 (3) and 3.735 (3) Å].