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In the title compound, [Co(C12H11N2O4)2(H2O)4]·4H2O, the CoII atom lies on an inversion center and is octahedrally coordinated by six O atoms from four water molecules and two monodentate zwitterionic 2-methylbenzimidazolium-1,3-diacetate ligands. An intramolecular O—H...O hydrogen bond occurs. In the crystal, intermolecular O—H...O hydrogen bonds link the molecules into a three-dimensional network. π–π interactions between the imidazole and benzene rings [centroid–centroid distance = 3.9031 (17) Å] consolidate the crystal packing.