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In the title compound, C16H13N5O2S, the five non-H atoms of the urea linkage adopt a planar configuration owing to the presence of an intramolecular N—H...O hydrogen bond. The maximum deviation from planarity is 0.022 (2) Å. The thiadiazole and pyridine heterocyclic rings are close to being coplanar, with a dihedral angle of 6.7 (2)° between their mean planes. Intermolecular N—H...O hydrogen bonds link two neighbouring molecules into centrosymmetric R22(8) dimers. Four C atoms and the attached H atoms of the benzene ring are disordered over two positions of equal occupancy.