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The title complex, [Co(C8H8O5)(H2O)3]·H2O, was synthesized by reaction of cobalt acetate with 7-oxabicyclo[2.2.1]heptane-2,3-dicarboxylic anhydride (norcantharidin) in aqueous solution. In the molecule, the CoII atom is six-coordinated in a distorted octahedral environment, binding to the bridging O atom of the bicycloheptane unit, to two O atoms from monodentate carboxylate groups and to three water O atoms. The crystal structure is stabilized by several O—H...O hydrogen-bonding interactions involving both the coordinated and uncoordinated water molecules as donors and the carboxylate O atoms of neighbouring molecules as acceptors.