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The title compound, {[Mn3(C10H5O7)2(C10H8N2)2]·H2O}n, was synthesized under hydrothermal conditions. Six carboxylate groups of six 5-(carboxylatomethoxy)benzene-1,3-dicarboxylate anions (OABDC3−) join three MnII ions into a trinuclear centrosymmetric [Mn3(μ2-COO)6] unit with one Mn site situated on a centre of inversion. The latter MnII ion exhibits a distorted MnO6 coordination, whereas the other MnII ion has a trigonal–bipyramidal MnN2O3 coordination environment resulting from three carboxylate O atoms and the two N atoms of the bipyridine ligand. Adjacent units are linked to each other by OABDC3− ligands into a layer parallel to (010). Within the layer, O—H...O hydrogen-bonding interactions involving the uncoordinated and half-occupied water molecule and the free carboxylate O atoms are observed. The layers stack along [010], constructing a three-dimensional structure through π–π interactions between adjacent pyridine rings, with a centroid–centroid distance of 3.473 (5) Å.