The novel title Zn(II) coordination polymer, poly[bis(mu-6-thioxo-1,6-dihydropyridine-3-carboxylato-kappa(2)S:O)zinc(II)], [Zn(C6H4NO2S)2]n, consists of two crystallographically independent zinc centers and two 6-mercaptonicotinate (Hmna-) ligands. Each Zn(II) atom is four-coordinated and lies at the center of a distorted tetrahedral ZnS2O2 coordination polyhedron, bridged by four Hmna- ligands to form a two-dimensional (4,4)-network. Each Hmna- ion acts as a bridging bidentate ligand, coordinating to two Zn(II) atoms through the S atom and a carboxyl O atom. The metal centers reside on twofold rotation axes. The coordination mode of the S atoms and N-H...O hydrogen-bonding interactions between the protonated N atoms and the uncoordinated carboxyl O atoms give the extended structure a wavelike form.