In the polymeric title complex, [Mn(C9H9O2S)2(C10H8N2)(H2O)2]n, the Mn2+ cation and the 4,4′-bipyridine ligand lie on a twofold rotation axis. The cation has an MnN2O4 octahedral environment, being coordinated by the O atoms of two water molecules and two monodentate (4-tolylsulfanyl)acetate anions, and by two N atoms of two 4,4′-bipyridine ligands. The latter bridge adjacent cations into linear chains parallel to [010]. The chains are further linked with each other into a two-dimensional network parallel to (100) via intermolecular O—H...O hydrogen bonds.