The mol-ecular geometry of the complex cation in the title structure, [(μ-Cl)(3){Ru(II)(η(6)-C(6)Me(6))}(2)][Fe(III)Cl(4)], compares very well with that reported earlier for the corresponding PF(6) (-) salt [Pandey et al. (1999 ▶). J. Organomet. Chem.592, 278-282]. The [FeCl(4)](-) counter ion has a rather regular tetra-hedral geometry with Fe-Cl distances and Cl-Fe-Cl angles in the range 2.1891 (7)-2.2018 (8) Å and 107.10 (3)-110.56 (3)°, respectively. There are no significant inter-molecular inter-actions in the crystal except for some weak C-H⋯Cl contacts, which in turn indicates that the crystal packing is determined predominantly by electrostatic inter-actions between the ionic constituents.