The asymmetric unit of the title salt, (C8H10N3)[FeCl4], contains one 1,3-dimethyl-1H-1,2,3-benzotriazol-3-ium cation and one tetra-chloridoferrate anion. The Fe(III) atom in the anion is tetra-hedrally coordinated by four Cl atoms. In the crystal, inter-actions are observed between the Cl atoms and the triazolium ring [Cl⋯centroid distances = 3.587 (3) and 3.866 (3) Å].