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In the mononuclear title complex, [Ni(C14H6O8S2)(C12H8N2)2(H2O)], the NiII atom is in a distorted octahedral coordination formed by four N atoms from two chelating 1,10-phenanthroline ligands and by two O atoms, one from a 9,10-dioxoanthracene-1,5-disulfonate ligand and the other from a water molecule. An intramolecular O—H...O hydrogen bond occurs. In the crystal, intermolecular O—H...O hydrogen bonds link the mononuclear complexes into chains extending parallel to [010]. Furthermore, π–π stacking interactions [centroid–centroid distance = 3.5696 (6) Å] stabilize the crystal structuure.