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In the title compound, [Co(NO3)(C9H11N3)2]Cl·3H2O, the CoII atom is coordinated by four N atoms from two chelating 2-(2-aminoethyl)-1H-benzimidazole ligands and two O atoms from one nitrate anion in a distorted octahedral coordination environment. In the crystal, N—H...Cl, N—H...O, O—H...Cl and O—H...O hydrogen bonds link the complex cations, chloride anions and solvent water molecules into a three-dimensional network. π–π interactions between the imidazole and benzene rings and between the benzene rings are observed [centroid–centroid distances = 3.903 (3), 3.720 (3), 3.774 (3) and 3.926 (3) Å].