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In the centrosymmetric polymeric title compound, {[CoHo2(C14H8N2O5)4(H2O)4]·4H2O}n, the HoIII ion is coordinated by one water molecule and four 5-(pyridine-4-carboxamido)isophthalate (L) ligands in a distorted square-antiprismatic arrangement. The CoII ion, located on an inversion center, is coordinated by two pyridine N atoms, two carboxylate O atoms and two water molecules in a distorted octahedral geometry. One L ligand bridges two Ho ions and one Co ion through two carboxylate groups and one pyridine N atom. The other L ligand bridges two Ho ions and one Co ion through two carboxylate groups, while the uncoordinated pyridine N atom accepts a hydrogen bond from an adjacent coordinated water molecule. Extensive O—H...O, N—H...O and O—H...N hydrogen bonding is present in the crystal.