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In the title centrosymmetric dinuclear compound, [Mn2(SO4)2(C13H8N4)2(H2O)4]·2H2O, the MnII atom is octahedrally coordinated by two N atoms from a 1H-imidazo[4,5-f][1,10]phenanthroline (ip) ligand, two O atoms belonging to two bridging sulfate anions and two water O atoms. In the crystal structure, the complex molecules and the uncoodinated water molecules are connected by O—H...O, O—H...N and N—H...O hydrogen bonds into a three-dimensional network. A π–π stacking interaction between the pyridyl ring of the ip ligand and the benzene ring of the neighboring ligand [centroid–centroid distance = 3.579 (2) Å] is also observed.