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In the title compound, [Pb(NO3)2(C6H6N4S2)2]·2H2O, the PbII cation is N,N′-chelated by two 2,2′-diamino-4,4′-bi-1,3-thiazole (DABT) ligands and further is cis coordinated by two nitrate anions in a distorted PbN4O2 octahedral geometry. One of the uncoordinated water molecules is close to an inversion center and is disordered equally over two sites. Intramolecular N—H...N and N—H...O interactions are present. An extensive hydrogen-bonding network of types N—H...O, O—H...O, O—H...N and O—H...S consolidates the crystal structure.