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In the title compound, [Yb2(C5H2N2O4)2(SO4)(H2O)2]n, the YbIII ion is eight-coordinated by four O atoms and one N atom from three imidazole-4,5-dicarboxylate ligands, two O atoms from one SO42− anion (site symmetry 2), as well as one O atom of a water molecule, giving a bicapped trigonal–prismatic coordination geometry. The metal coordination units are connected by bridging imidazole-4,5-dicarboxylate and sulfate ligands, generating a heterometallic layer. The layers are stacked along the a axis via N—H...O, O—H...O, and C—H...O hydrogen-bonding interactions, generating a three-dimensional framework.