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In the asymmetric unit of the title compound, [Mn(C2O4)(C3H10N2)2]Cl·H2O, there are two independent MnIII complexes, two Cl− anions and two uncoordinated water molecules. Each MnIII atom is hexacoordinated by four N atoms from two propane-1,3-diamine ligands and two O atoms from one oxalate ligand, resulting in a slightly distorted octahedral MnO2N4 geometry. Mn—O and Mn—N bond lengths are in the ranges 1.969 (2)–2.020 (3) and 2.068 (3)–2.113 (4) Å, respectively. There are weak intermolecular O—H...O, O—H...Cl, N—H...O and N—H...Cl hydrogen bonds with D...A distances in the range 2.831 (4)–3.423 (3) Å.