The title compound, [Ru(NCCH(3))(6)](CH(6)B(11)Br(6))(2)·CH(3)CN, consists of the 'naked' ruthenium(II) cation surrounded by six acetonitrile mol-ecules, each coordinated via the nitro-gen atoms in a linear or nearly-linear fashion in a typical octa-hedral over-all arrangement. The cation is balanced by the two hexa-bromo-carborane cage anionic fragments [CB(11)H(6)Br(6)]. Weak C-H⋯Br and B-H⋯Br inter-actions link neighboring anions.