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The crystal structure of the title compound, [Mn(C14H13NO2)2(H2O)3](NO3)2, is comprised of two Schiff base 2-methoxy-6-(N-phenylcarboximidoyl)phenol (HL) ligands and three coordinated water molecules. The MnII ion lies on a twofold axis that bisects one water O atom. The coordination sphere of the five-coordinate Mn atom is completed by the two monodentate HL ligands and three coordinated water molecules binding through their O atoms, affording a distorted tetragonal–pyramidal geometry. In the phenolate ligands, the hydroxy H atom transfers to the imine N atom. This H atom is also involved in an intramolecular N—H...O hydrogen bond that imposes a nearly planar conformation on each ligand, with dihedral angles of 2.78 (3) and 2.43 (5)° between the aromatic rings of each ligand. In the crystal, molecules are linked by intermolecular O—H...O hydrogen bonds.