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The hydrothermal reaction of cadmium(II) nitrate with 5-amino-2,4,6-triiodoisophthalic acid and pyridine in DMF solution leads to the formation of the title compound, [Cd(C8H2I3NO4)(C5H5N)2]n. The structure contains a four-coordinate Cd2+ ion in a distorted tetrahedral geometry, which lies on a crystallographic twofold rotation axis. The Cd2+ ion is bonded to two N atoms from two pyridine ligands and two carboxylate O atoms from two 5-amino-2,4,6-triiodoisophthalate anions. The Cd—O distances are 2.429 (5) and 2.305 (5) Å and the Cd—N distance is 2.236 (8) Å. The two carboxylate groups of individual 5-amino-2,4,6-triiodoisophthalate anions act as a bridge to the Cd2+ atoms. leading to a chain structure along the c axis.