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The title compound, (C4H8N3O)(H3O)[Co(C7H3NO4)2]·3H2O, contains a protonated creatininium cation, a hydroxonium (H3O)+ cation, a [Co(pydc)2]2− (pydcH2 = pyridine-2,6-dicarboxylic acid) complex anion, and three uncoordinated water molecules. The CoII atom is coordinated by four O and two N atoms from two pydc ligands in a distorted octahedral environment. The structure also contains three uncoordinated water molecules. Extensive intermolecular O—H...O, N—H...O and C—H...O hydrogen bonds, π–π stacking interactions [centroid–centroid distances = 3.565 (14) and 3.425 (14) Å] and O...π interactions [O...centroid distance = 3.480 (2) Å] connect the various components in the crystal structure.