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In the title compound, {[La(C6H4NO2)2(H2O)4]Cl}n, the LaIII atom lies on a twofold rotation axis and is eight-coordinated by four O atoms from four isonicotinate ligands and four water molecules in a distorted square-antiprismatic coodination environment. Adjacent LaIII atoms are bridged by two carboxylate groups from two isonicotinate ligands, forming an extended chain along [001]. These chains are linked through O—H...N hydrogen bonds into a three-dimensional network with channels in which the chloride anions form O—H...Cl hydrogen bonds. Intrachain O—H...O hydrogen bonds and π–π interactions [centroid–centroid distance = 3.908 (2) Å] are also observed.