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In the title compound, {[La2(C10H11N2O5S)6(H2O)4]·2C10H8N2·14H2O}n, the LaIII ions are in a slightly distorted bicapped trigonal prismatic geometry, and are linked by six carboxylate groups in a syn–syn bidentate bridging fashion to form a one-dimensional inorganic–organic alternating linear chain. These polymeric chains generate microchannels extending along [100], and these cavities are occupied by discrete tetradecameric water clusters, which interact with their surroundings and finally furnish the three-dimensional supramolecular network via 15 O—H...O, one O—H...S, two O—H...N and six N—H...O classical hydrogen bonds. 4,4-Bipyridine acts as an inserting component and hydrogen-bond acceptor, and it is a nonplanar molecule with a dihedral angle of 33.12 (13)° between the pyridine rings. Owing to the numerous classical hydrogen bonds, the observed weak intermolecular C—H...O, C—H...π and π–π stacking interactions can be neglected with regard to stabilizing the network.