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In the title complex, [Mn(C10H6O7)(C12H8N2)2(H2O)]·2H2O, the MnII atom is coordinated by two O atoms from one 2-(3-carboxy-5-carboxylatophenoxy)acetate (HOABDC2−) dianion and one water molecule and by four N atoms from two 1,10-phenanthroline (phen) ligands within a distorted octahedral geometry. O—H...O hydrogen bonding between –COOH and –COO− groups of adjacent molecules and between carboxylate groups and coordinated and uncoordinated water molecules leads to a three-dimensional structure which is further stabilized by weak π–π interactions of adjacent phen ligands with centroid–centroid separations of 4.2932 (1) Å.