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In the title coordination polymer, {[AgNd(C5H3N2O2)2(C2O4)]·H2O}n, the NdIII atom is coordinated in a distorted monocapped square-antiprismatic geometry by two O and two N atoms of two N,O-bidentate pyrazine-2-carboxylate (2-pzc) ligands, four O atoms of two bidentate oxalate ligands, and one O atom of a monodentate carboxylate group of a 2-pzc ligand. The AgI ion is coordinated in a distorted tetrahedral geometry by two N atoms from two monodentate 2-pzc ligands, one O atom from one monodentate oxalate ligand and one O atom of a bridging carboxylate group of a 2-pzc ligand. The oxalate anions link neighbouring neodymium(III) metal centres into Nd–oxalate chains, which are interconnected by Ag(2-pyz)2 units, forming a three-dimensional polymeric framework. Intermolecular O—H...O and C—H...O hydrogen bonds are observed in the crystal structure.