In the structure of the title compound, C15H13N2O+·C7H7O3S−, the cation has a Z geometry about the ethyl­ene bridge that links the heterocyclic and aromatic rings. The skeleton of the cation is slightly non‐planar; the dihedral angles between the ethyl­ene linkage and the pyridinium ring and p‐hydroxy­phenyl ring are 9.2 (1) and 2.0 (1)°, respectively. In the crystal structure, the cations are stacked along the b axis, with a head‐to‐tail orientation, and weak inter­molecular C—H⋯N hydrogen bonds link the cations into chains along the a axis. In addition, inter­molecular O—H⋯O and C—H⋯O hydrogen bonds between cations and anions link two such chains together with a mean inter­planar distance of 3.23 Å between cations.

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