In the title compound, C 13H 12N 4OS, the dihedral angle between the triazole and naphthalene ring systems is 67.42 (5)°. In the crystal, adjacent molecules are linked via two pairs of intermolecular N—H⋯S interactions, forming R 2 2(8) and R 2 2(10) ring motifs. Weak C—H⋯S interactions generate infinite chains along [001] and the structure is further consolidated by C–H⋯π bonds and aromatic π⋯π stacking interactions [distance between the centroids of the triazole rings = 3.2479 (7) Å].