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The asymmetric unit of the title salt, 2C13H11N4S+·SO4−, comprises two 4-(5-anilino-1,3,4-thiadiazol-2-yl)pyridinium cations and one sulfate anion. In one cation, the phenyl ring is inclined to the pyridinium ring at a dihedral angle of 34.82 (6)°, while in other cation the rings are almost coplanar with a corresponding dihedral angle 5.33 (10)°. Strong N—H...O hydrogen bonds link the cations to the sulfate anion in the asymmetric unit. Additional N—H...O, C—H...N, C—H...O and C—H...S hydrogen bonds further stabilize the crystal structure. Weak C—H...π and π–π interactions are also observed in the crystal structure.