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The asymmetric unit of the title compound, C8H9N3O2S·0.5H2O, contains two thiosemicarbazide molecules with the short distance of 3.521 (3) Å between the centroids of the benzene rings, and one water molecule. In the two independent molecules, the benzene rings and the thiosemicarbazone fragments are twisted at 9.2 (3) and 18.5 (3)°. An extensive three-dimensional hydrogen-bonding network, formed by intermolecular N—H...O, N—H...S and O—H...O hydrogen bonds, consolidates the crystal packing.