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In the title compound, {[Zn(C9H10NO3)(C10H8N2)2(H2O)]NO3·2H2O}n, the ZnII atom is six-coordinated in a distorted octahedral geometry by two carboxylate O atoms and one amino N atom from two l-tyrosinate ligands, two N atoms from two 4,4′-bipyridine ligands, and one water molecule. Adjacent Zn atoms are bridged by the bidentate carboxylate groups into a cationic chain extending along [010]. N—H...N, O—H...N and O—H...O hydrogen bonds link the cationic chains, nitrate anions and uncoordinated water molecules into a supramolecular network. π–π interactions between the pyridine rings and between the pyridine and benzene rings [centroid–centroid distances = 3.615 (4) and 3.636 (4) Å] are present.