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In the title compound, {[Co(C8H4O4)(C10H8N2O2)(H2O)2]·C10H8N2O2}n, the CoII atom, lying on an inversion center, is hexacoordinated in a distorted octahedral geometry defined by two O atoms from two terephthalate (tp) ligands, two O atoms from two 4,4′-bipyridine N,N′-dioxide (bpydo) ligands and two water molecules. The coordinated tp and bpydo ligands and uncoordinated bpydo molecule all have an inversion center. The CoII atoms are connected by the tp and bpydo ligands into a layer parallel to (111). In the crystal, O—H...O hydrogen bonds link the uncoordinated bpydo molecules and the layers into a three-dimensional supramolecular structure. Intralayer O—H...O hydrogen bonds and π–π interactions [centroid-to-centroid distances = 3.6643 (13) and 3.8048 (13) Å] are also observed.