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The title compound, {[Tb(C 7 H 3 NO 4 )(C 7 H 4 NO 4 )(H 2 O) 2 ]·2H 2 O}  n  , is isotypic with the analogous Tm III  compound [Li, Zhang, Wang & Bai (2009).  Acta Cryst . E 65 , m411]. The Tb III  atom is octa­coordinated by two water mol­ecules and by four carboxyl­ate O atoms and two pyridyl N atoms from two pyridine-2,5-dicarboxyl­ate (2,5-pydc) and two 6-carboxy­nicotinate (2,5-Hpydc) ligands. The 2,5-pydc and 2,5-Hpydc ligands bridge Tb III  atoms, generating helical coordination polymers along [001]. An extensive network of O—H⋯O hydrogen bonds is formed between the coordination polymers and the uncoordinated water mol­ecules. The refined Flack parameter of 0.54 (2) suggests inversion twinning.

catena-Poly[[[diaquaterbium(III)]-μ-6-carboxynicotinato-μ-pyridine-2,5-dicarboxylato] dihydrate]